Answer:
A protostar looks like a star but its core is not yet hot enough for fusion to take place. The luminosity comes exclusively from the heating of the protostar as it contracts. Protostars are usually surrounded by dust, which blocks the light that they emit, so they are difficult to observe in the visible spectrum.
Explanation:
A protostar is not considered a star until it gets its energy from nuclear fusion instead of gravitational contraction. Gravitational contraction is the process of a cloud's gravity overcoming its internal pressure and causing a collapse.
A protostar is the stage in a star's life before it is hot enough to fuse hydrogen (13 million K). Fusion is the opposite idea to the atomic bombs dropped on Japan. Those bombs split atoms (specifically U-235?), where as in fusion, atoms are fused together. Protostars are simply out hot enough to fuse Hydrogen, and therefore are not main sequence stars like our sun.
Main sequence stars are stars that fuse hydrogen and exhibit a state of "Hydrostatic Equilibrium". Hydro-what? HE (as I'll call it) is where the fusion in a stars core counter acts the force of gravity attempting to compress the star.
Protostars do not exhibit this characteristic, rather they are in a state of collapse until they are compressed to a point where pressure is high enough to have a temperature high enough to fuse Hydrogen.
Protostars do fuse protons to Deuterium (a isotope of helium) but don't worry about this.
Protostars are technically stars, but I think you were asking how they defer from other stars.
Have a wonderful day :-D
PLEASE HELP
Which of the following is the best example of gene flow?
Wind blows pollen from one population of plants to another, and cross-fertilization occurs.
An earthquake results in the formation of a canyon, splitting a population of toads apart.
Genes are shuffled by the crossing over of chromosomes during meiosis.
A small population of humans colonizes a newly formed island.
Answer: Wind blows pollen from one population of plants to another, and cross-fertilization occurs. brainliest?
Explanation:
The best example of gene flow is Wind blows pollen from one population of plants to another and cross-fertilization occurs.
What do you mean by pollination?A pollinator is anything that helps carry pollen from the male part of the flower (stamen) to the female part of the same or another flower (stigma).
Self-pollination is the transfer of pollen from the anther to the stigma of the same flower.
Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a different.
Thus, option A is correct, as pollination leads to fertilization which involves the gamete's interaction.
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PLEASE HELP ME!!!!
IT IS FOR BIOLOGY!!!
Answer:
d. selective breeding
Explanation:
Earth is made up of
layers.
Answer:
multiple different layers and that's how we also have different types of rocks like sedimentary
A.Bacteria and mold
B. deer
C.grasses
D.mountain lion
Please help
The reticular formation ________.
A) sets the rate of respiratory movements
B) contains nuclei and centers that regulate vital autonomic nervous system functions
C) relays somatic information to the ventral posterior nuclei of the thalamus
D) regulates heart rate and force of contraction, and distribution of blood flow
E) relays information from the spinal cord, the red nuclei, other midbrain centers, and the cerebral cortex to the vermis of the cerebellum
Answer:
B) contains nuclei and centers that regulate vital autonomic nervous system functions
Explanation:
The correct option is - B) contains nuclei and centers that regulate vital autonomic nervous system functions
Reason -
The reticular formation contains nuclei and centers that regulate vital autonomic nervous system functions.
10. Explain why the feel of gypsum and talc can be used to distinguis
between the minerals?
A. GUC
B. CGU
C. UCG
D. UGU
Answer:
A
Explanation:
it'll go GUC➡️CAG➡️GUC
I NEED HELP ASAP DUE IN 10 MINUTES
The herbivores in the forest don’t consume this low-growing invasive plant because they mistake it for a similarly shaped toxic plant in the forest. The invasive plant needs a lot of room to grow. It sprouts from its seeds much earlier than the native species. What effect can its growth have on the native herbivores’ food supply?
Answer:
It could grow at such an extrem erate that it could use up all natural resources that the native species needs to survive. thus breeding out all native species and becoming a invasive species. The native species the animals eat now does not exist and the animals that needed that food will decrease drastically in populus.
Explanation:
Help will mark brainiest
Answer:
Amino acids are the building blocks of proteins
There are many possibilities that could happen if the sequence of amino acids were to change. It could potentially create a completely different protein with a different function, or it could create a more efficient protein but this is less likely.
Explanation:
how is population dynamics in animals affected by sewage water release
plzz helppp
Answer:
It may be that synthesis in population dynamics has been slow to emerge because population change is more complicated than it first appears. After all, population change is determined ultimately by only four factors: birth, death, immigration, and emigration.
Explanation:
Research has shown that population size and growth are important factors in the emission of greenhouse gases. ... While population-driven emissions from developed nations are estimated to contribute 42 percent of CO2 emissions between 1985 and 2020, they are expected to contribute only 3 percent between 2025 and 2100.
If sewage is only partially treated before it is disposed of, it can contaminate water and harm huge amounts of wildlife. Alternatively, leaking or flooding can cause completely untreated sewage to enter rivers and other water sources, causing them to become polluted. The consequences aren't great
Factors influencing population growth
+Economic development. ...
+Education. ...
+Quality of children. ...
+Welfare payments/State pensions. ...
+Social and cultural factors. ...
+Availability of family planning. ...
+Female labour market participation. ...
+Death rates – Level of medical provision.
Hoped this helped! <3
which of the following properties of water are essential for life on Earth?
Answer:
Option D
Explanation:
Complete question
which of the following properties of water are essential for life on Earth?
A) polarity
B) Cohesion & Adhesion
C) High heat capacity
D) All the above
Solution
Some essential properties of water are as follows –
a) Polarity
b) Solvent
c) High heat capacity - it is essential to maintain the temperature on earth. The water bodies are comparatively cooler than the temperature of earth
d) High heat of vaporization
e) Cohesion – It is essential for surface tension & capillary action
f) Adhesion – It is essential for surface tension & capillary action
g) Lower freezing density – Due to this reason, ice is lighter than water
Hence, option D is correct
*PLEASE ANSWERR!!*
What is the second step in fieldwork for marine science?
a.) presentation
b.) analysis
c.) collection
Answer:
its b
Explanation:
I hope this help
Mmm
When a person is suddenly cut by a sharp object, a nervous impulse is sent along a sensory neuron to the spinal cord. The impulse is immediately transmitted through motor neurons to produce a response. Which of the following correctly identifies and describes this response?
A.It is a leamed response that does not occur in infants and small children
B. It is a reflex response that causes various muscles to contract in order to move away from the object.
C.It is a conditioned response that occurs only to prevent injury!
D. It is a voluntary response that is initiated only after the impulse has been caried to the relevant area of the brain.
Answer:
B. It is a reflex response that causes various muscles to contract in order to move away from the object.
Explanation:
I just took the Test
It is a reflex response that causes various muscles to contract in order to move away from the object. Therefore, option (B) is correct.
What is reflex response?A reflex response is an automatic, involuntary response to a stimulus that does not involve the conscious part of the brain. In this case, the reflex response causes various muscles to contract in order to move away from the sharp object, which helps to minimize further injury. Reflexes are a protective mechanism that can operate without the need for conscious control or decision making.
The reflex response described in this scenario is not a learned response, a conditioned response, or a voluntary response. It is an innate, automatic response that occurs in response to a specific stimulus, and it occurs in both infants and adults.
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When the heart is in fibrillation, A) there is no contraction of the myocardium. B) effective pumping of the ventricles ceases because the myocardial cells fail to work as a team, and the brain cannot get adequate oxygen. C) the myocardial cells may become damaged from contracting too fast. D) the myocardial cells deplete their oxygen supply because they are contracting too fast, and the lactic acid produced damages the myocardial cells. E) the myocardial cells are contracting together as they should; fibrillation indicates a normal sinus rhythm of 75 beats per minute.
Answer:
The correct answer is - B) effective pumping of the ventricles ceases because the myocardial cells fail to work as a team, and the brain cannot get adequate oxygen.
Explanation:
When the heart is in an irregular and rapid heart rate due to chaotic electrical signals in the atrial chambers of the heart which leads to a very fast heart rhythm that shows 100 to 175 heart rate. That leads to failure of the myocardial cells that stop the pumping of the ventricles effectively and therefore blood would not reach the brain and the brain would not get an adequate amount of oxygen. This will result in organisms experiencing faint, blackout or stroke-like complications.
2. What are the steps of the dichotomous key?
Answer:
1.list down the characteristics
2.Organnize the characteristics in order
3.divide the specimens
4.divide the specimens even further
5.draw a dichotomous Key diagram
6. test it out
Which of the following is not a product or use of tropical rainforests?
a.
food
b.
medicine
c.
tourism
d.
none of the above
Please select the best answer from the choices provided
A
B
C
D
Answer:
D
Explanation:
Trees give food
Tourist come to see trees sometimes
Medicine sometimes comes from tree herbs
That's all I know..hope it helps
Answer:
its d guys !
Explanation:
Son Órganos que desempeñan la misma función, pero tienen una constitución anatómica diferente, hablamos de
Answer:
órganos análogos
Explanation:
Los órganos análogos son aquellos que cumplen la misma función (o similares funciones), pero no poseen un origen evolutivo en común. Por otra parte, los órganos homólogos son aquellos que poseen un origen evolutivo común (es decir, derivan de un ancestro en común). Los órganos análogos pueden ser distinguidos durante desarrollo embrionario ya que ellos experimentan diferentes mecanismos para su formación. Estos órganos (análogos) han experimentado evolución convergente, es decir, representan estructuras similares las cuales han evolucionado a partir de organismos que no tienen un antepasado en común. Un ejemplo de órgano análogo es la presencia de alas en murciélagos y abejas.
6. The absorbed dose of electrons is 50 mrad. What is the equivalent dose in J/kg?
O 5.0 x 10-4 g/kg
500 J/kg
5.0 x 10-3 J/kg
50 J/kg
Answer:
5.0 x 10-4 g/kg
Explanation:
This is because
I mrad is equivalent to 1/100,000j/kg
Therefore,
To convert 50 mrad to j/kg
= 50/100,000
= 5 × 10^-4j/kg.
Millirad is a decimal unit or rad which is the unit for measuring absorbed ionization radiation.
HELP!!!! 50PTS!!!!! WILL BE MARKED BRAINLIEST!!!!
Adaptive radiation is often seen after which of the following events? (4 points)
Mass extinctions
Sexual selection
Genetic drift
Founder effect I think is A
Answer:
genetic drift I'm pretty sure
Explanation:
have an amazing day!!!!!!!
Answer:
mass extinctions
Explanation:
What is the relationship between photosynthesis and respiration?
A Photosynthesis produces water, while respiration does not. .
B. Respiration requires sunlight, while photosynthesis does not.
C. Photosynthesis produces oxygen, and oxygen is required for respiration
D. Respiration produces glucose, and glucose is required for photosynthesis iser
Answer:
c.
Explanation:
That be your answer mate.
Answer:
the correct answer is c
Explanation:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.
GIVING 100 BRAINLY POINTS AND BRAINLEST.
Part A Cut a 7-inch-diameter circle out of card stock. Draw a spiral on the circle as shown. Next, use the scissors to cut along the lines you drew starting on the outside and ending in the center. Use the hole punch or scissors to make a hole at the middle of the spiral and attach the thread with a knot. Tie the other end of the thread loosely around the center of the stick so you can suspend the spiral in the air. Fill the pot with 2 inches of water. Heat the water until it boils, and then turn off the heat source. Let the pot sit for 4 minutes. Holding the ends of the stick with the spiral attached, position the bottom of the spiral right above the top of the pot so it’s not touching the water. Describe what happens.
Answer:
the spiral stick wouldnt be wet because it isnt touching the water, so therefore the sprial stick wouldnt be hot because it isnt touching the water.
Explanation:
Answer: yeah it’s 50.
Explanation:
A variegated leaf with green and yellow patches is used for an experiment to prove that chlorophyll is required for photosynthesis. Before the experiment the green portions (A), and the yellow portions (B), arte observed. What will be the colour of „A‟ just before and after the starch test? Also write the equation of photosynthesis and mark, well ash molecule the by-product is obtained.
Answer: The colour of A before the starch test is GREEN while after the starch test is BLUE- BLACK. The equation for photosynthesis is
6CO2 + 6H2O → C6H12O6 + 6O2.
Explanation:
PHOTOSYNTHESIS is the process by which green plants use energy from sunlight to manufacture their own food. It is a building up process since simple inorganic compounds such as carbondioxide and water are built up into large organic compounds such as glucose and OXYGEN is given off as a by product.
Oxygen given out in photosynthesis occurs in the light stage during the process of photolysis of water. This occurs when the chlorophyll traps, absorbs and captures light energy and become energised. The energised chlorophyll supplies energy which is to split molecules of water into hydrogen ion ( H+) and hydroxyl ion ( OH-). The hydroxyl ion is reconverted to water and oxygen is given out as a by product.
To show that chlorophyll is NECESSARY for photosynthesis, a variegated leaf with green and yellow patches is used for an experiment.
The green portion is marked A and the yellow portion marked B. The leaf is tested for starch using the procedure below:
--> place leaf in boiling water for half a minute to kill it.
--> decolorize leaf by placing it in hot alcohol.
--> dip decolorize leaf in hot water to soften it.
--> place leaf on tile and add iodine solution to it.
RESULT: It would be found that only the green parts contain starch as blue+black colouration is observed while yellow area is unaffected by iodine.
What are the similarities and differences between a nerve cell and a typical animal cell?
Answer:
Hi Rudaba
Where r u from ??
I am Ahaana
Cells are the structural and functioning units of all living organism. They formed the foundation all living organism.
Based on location and functions, there are different types of cells. Because some cells transfer messages from one part of the body to another, they are have a head like structure(the cell body) and a a long pipe shaped structure (axon) and with branches at the end ( dendrites) .These cells are nerve cells. They are located in the CNS and PNS.
Other cells on animals have almost the same shape with some variations.
Similarities.
Both contains Nucleus, mitochondria
Both contains fluid inclusion called cytoplasm where all organelles,
Both bounded layer of cell membranes to restrict movement the cells organelles and to give shapes.
Differences;
Typical animals cells are of different colors based on location in organs .But
nerve cells are made of the grey color ( granules) of the cell body and white color of the axon. This is uniform for all nerve cells.
Animal cells performs different functions in animals based on location, but nerve cell is for transmission of impulses and action potential only.
Animal cells undergo regeneration after death or damage. The Regeneration of nerve cells is slow or not possible in most cases. This is the reasons why most neurological disease are incurable.
Animal cells are made up of three distinct parts: the cell membrane, cytoplasm and the nucleus. Cell body, axon and dendrite are the parts of a nerve cells.
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b) How does adaptation affect the survival of a species? Why?
In evolutionary theory, adaptation is the biological mechanism by which organisms adjust to new environments or to changes in their current environment. This enables better survival and reproduction compared with other members of the species, leading to evolution.
Explanation:
If you want more info, you can check out this site. It is safe and secure.
https://www.nationalgeographic.org/encyclopedia/adaptation/
which of these is a plantation crop?
a)Coffee
b)Tea
c)Spices
d)All of these
choose one
Answer:
D) All Of These
Explanation:
Tea, Coffee, and Spices are a plantation crop.
Answer:
the right answer is D all of these
27)
Natural selection produces changes most quickly in
A)
species with short reproductive cycles
B)
complex multicellular organisms
C)
individuals that produce a small number of offspring
D)
individual pathogens killed by antibiotics
Answer:
A) species with short reproductive cycles
Which will diffuse easily in the cell membrane: Molecules that are lipids or molecules that are ionic (charged).
Answer: Molecules that are lipid soluble because the cell membrane is a phospholipid bilayer.
Explanation:
Which condition is NOT a requirement of the Hardy-Weinberg equilibrium?
A. No mutations in a population
B. No net migration of alleles into or out of the population
C. Sexually reproducing and randomly mating in a population
D. Small population with genetic drift
Answer:
D since people need to produce more, producing in a small population with genetic drift is not a requirement Hardy Weinberg equilibrium
3. The leaf relates to ____ because it's cells are numerous in
chloroplast
Answer:
photosynthesis
Explanation:
what is the difference between the open-water zone and the deep water Zone