Answer:
Red blood cells transport oxygen around the body. They are specialised to carry oxygen because they: contain large quantities of a protein called haemoglobin , which can bind oxygen. don't have a nucleus, so there is more room for haemoglobin.
Explanation:
Strontium-90 has a half life of 29 years, how much strontium-90 is left from the Chicago pile reactor that was active around 87 years ago.
Answer:
The answer is below
Explanation:
The half life of a substance is the time required by that substance to reduce to half of its initial value. The half life is calculated using the formula:
[tex]N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\where\ N(t)=quantity\ of\ substance \ remaining, N_o=initial\ quantity\\of\ substance, t=time\ and \ t_\frac{1}{2}=half\ life\ of\ substance[/tex]
Given that t = 87 years, half life = 29 years, therefore the quantity of strontium-90 left is:
[tex]N(t)=N_o(\frac{1}{2} )^\frac{87}{29} \\\\N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\N(t)=N_o(\frac{1}{2} )^3\\\\N(t)=\frac{1}{8} N_o[/tex]
That is one-eight of Strontium 90 would be left after 87 years
How does deforestation impact humans and the planet? What solutions can help combat the effects of deforestation? 3 - 5 sentences
Answer: Deforestation also degrades soil quality and is a major cause of the world's rapid desertification. Such weather patterns and environmental changes contribute to the plummeting of the agricultural production. Humans are hit by food shortage due to the low agricultural produce. Anyone can make a difference at some level by contributing to the fight to save forests and wildlife by making informed choices on a daily basis. Using ecofriendly products, eating sustainable foods, recycling more, and conserving water and energy can help to lead towards zero deforestation.
Explanation: Have a great day or night :)
How many peaks are on this map? Answer
А 1
B 2
C 3
D 4
Answer:
C. 3
Explanation:
If you look at the map, the tiny circles represent the peaks. Count the small circles (three) and you have your answer!
Each level of the energy pyramid is called a trophic level. How does the amount of energy available to organisms differ at each trophic level in a food chain?
Answer:
Most of the food energy that enters a trophic level is "lost" as heat when it is used by organisms to power the normal activities of life. Thus, the higher the trophic level on the pyramid, the lower the amount of available energy
In which direction will the object move?
Answer:
in the left direction.
Explanation:
since the force applied from the right is greater than the left and the force applied from below is opposite, which leaves no change in displacement.
therefore, the object would move to the left direction.
Hope this helps! have a great day ahead!
Active transport, unlike its passive counterpart, is beneficial because it can move large, polar molecules against the concentration gradient (L to H).
A. True
B. False
The nervous system primarily communicates using
electrical impulses
hormones
blood cells
none of the above
Answer:
electrical impulses
Explanation:
Which statement best explains why the
carbon cycle is classified as a closed-loop
system?
Answer:
You need more info for this to work. theres no context
Explanation:
dentify the plant organs seen in the drawing.
A
B
C
Answer:
b
Explanation:
Using an example, (either molecular or macroscopic, or both if you can) describe how a mutation could have no effect on the organism. have a negative effect on the organism have a beneficial/positive effect on the organism.
Answer:
i rly dont know i just need points
Explanation:
pilot
An energy pyramid is represented below. The energy for use by
organisms in level A originally comes from
Level
D
Level
с
Level
B
Level
A
Producers
The sun
O Level B
O Level D
Answer:
The answer is the sun.
Explanation:
Level a represents the producers which you can tell, by their name, that they make their food. Producers are mainly comprised of the plants of our world. They get their energy from the sun and through photosynthesis, they turn it into energy.
By the way, B would be primary consumers which are the herbivores, C are the secondary consumers which include us people, and D are the decomposers, which include worms.
Level A represents the producers which make their own food and are mainly comprised of the plants of our world. They gain energy from the sun and through the process of photosynthesis.
The energy for use by organisms in level A originally comes from sun. Thus the correct option is A.
What is photosynthesis?
The process through which green plants and some other organisms use sunlight to make foods from carbon dioxide and water. Photosynthesis in plants generally involves the green colour pigment chlorophyll and generates oxygen as a byproduct.
Whereas, B would be primary consumers which are the herbivores, C are the secondary consumers that include omnivorous, and D are the decomposers, which include worms.
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What variations can individuals exhibit?
Explanation:
Organisms (within populations) exhibit individual variation in appearance and behavior. These variations may involve body size, hair color, facial markings, voice properties, or number of offspring.
Use what you know about the formation of metamorphic rock to describe three events that could have led to the formation of the rock as it appears today
please i really need help
Answer:
1. a sedimentary rock was introduced to heat
2. It cooled into a solid
3. Wind and other debris could have altered the shape
A geneticist wants to determine what mutation in a DNA molecule changed the structure of a specific protein. What would the scientist need to know before planning the investigation?
Answer:
Explanation: 1+1
Species will compete until the ________ species wins.
A.) Stronger
B.) Smaller
C.) Bigger
D.) Weaker
Answer:
B.smaller
Explanation:
yeah maybe because smaller fastest:)
Answer:
A
Explanation:
The weakest obviously doesn't. Small or big dosn't matter. So it must be A.
can trees and plants cause soil erosion?
Answer:
no
Explanation:
it will not cause soil erosion because tree or plant root will handle it very strongly
A frame which is used for ecological sampling
Answer:
A quadrat is a frame (usually a square or a circle) of known area used to isolate a subset of the population. This subset will comprise one sample. Quadrats come in various sizes (and shapes) with the size selected determined by features of the organisms in the population to be sampled.
Explanation:
hope this helps
In the United
States, what is
the AVERAGE
beef cow herd
size?
A. 10 head
B. 25 head
C. 40 head
D. 70 head
Answer:In the United States the average cow herd size is C.40 herds
Explanation: 40 herds is the average
What are three terms used to describe organisms such as lions?
Answer:
The three terms that are used to describe organisms such as lions are third order heterotrophs, tertiary consumers and top carnivores. Lions are also known as ap ex or top predators.
The three terms that are used to describe organisms such as lions are third-order heterotrophs, tertiary consumers and top carnivores.
What is the best carnivore?As the top predator throughout its range, the tiger plays a significant role in controlling not only its prey population but that of other predators such as the leopard, and clouded leopard.
Thus, lions are third-order heterotrophs, tertiary consumers and top carnivores.
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Fur seals and sea lions have similar anatomy. They probably have a common ancestor.
What would 2 different species in an ecosystem ultimately compete for
Answer:
maybe you could put natural resources
Explanation:
like water, food, shelter, etc.
you could also put territory
i would say mating but you said two different animals lol
Which Enzyme has an optimal pH that is Acidic?
A. Pepsin
B. Salivary amylase
C. Arginase
Answer:
a. pepsin
Explanation:
it has a 1 to 2 level which is acidic because anything lower than 7 is acidic
Answer:
A. Pepsin
Explanation:
The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. Pepsin has an optimum of pH 2.5 and a working range of between pH 1-4.
I need someone to help me!!
Answer:
I believe the answer is B. Vomiting and Fever.
Explanation:
This answer makes the most sense as spoiled food can lead to sickness, which can lead to vomiting and fever.
Digestion of dietary fats _____. a. occurs primarily in the large intestine b. occurs primarily in the stomach c. involves the small intestine but not the pancreas d. results in triglycerides, phospholipids, and sterols as end products e. requires bile and lipase
The answer of the question is option (b).
Digestion of dietary fats ocuurs majorly when it reaches to the small intestine.
Why could reproductive cells from an apple tree and a banana tree never combine to form an offspring? Use data and scientific reasoning to construct an explanation.
Answer:
Difference in chromosome number.
Explanation:
The reproductive cells from an apple tree and a banana tree never combine to form an offspring because of the difference of species. There is different number of chromosomes in the both apple and banana tree. There are 17 number of chromosomes in apple whereas 33 number of chromosomes in banana tree so due to this difference in the chromosome number apple and banana tree can produce offspring due to combination.
The process of formation of new offspring from the parents is called reproduction. Reproduction help to ensure the continuity of species generation after generation. There are two types of reproduction, these are as follows:-
SexualAsexual.Reproduction required the gametes of the same species for fusion. The mating of the two gametes is known as fertilization.
According to the question, the apple tree and a banana tree never combine to form offspring because of the gamete difference, These gametes are from different species.
Hence, they cannot reproduce.
For more offspring, refer to the link:-
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What is the answer to this?
Answer:
I say the correct answer is the 3rd one.
Explanation:
Answer is number 3
Which kind of investigations are meant to provide large amounts of information about a wide range of variables?
Answer:
Comparative investigations
Explanation:
Answer:
Comparitive investigations
Which weather event usually includes heavy precipitation, strong circulating winds, develops over water, and has warmer surface air temperatures?
Answer:hurricane tropical cyclone
Explanation:
A hurricane is a large rotating storm with high speed winds that forms over warm waters in tropical areas. Hurricanes have sustained winds of at least 74 miles per hour and an area of low air pressure in the center called the eye
Which of the following is driven by energy from the sun?
A) Water Collection
B) Groundwater flow
C) Evaporation
D) Precipitation
Answer:
evaporation
Explanation:
the sun help evaporate the water into the clouds ^^
Answer:
C I think
Explanation:
Sorry if wrong
In an experiment determining the effects of antibiotics on the treatment of pneumonia in mice, two groups of mice with pneumonia are compared. One group, group A, receives no antibiotic, and the other group, group B, receives 10 mg/kg of body weight of a new antibiotic. Besides the administration of the antibiotic, there are no differences between the two groups of mice. What is the purpose of group A
Answer:
Group A is the control of the experiment
Explanation:
In an experiment, the control group is the group that does not receive any experimental treatment. The control groups are kept in the same condition as the experimental group except the variable being tested (independent variable).
In this question involving an experiment to determine the effects of antibiotics on the treatment of pneumonia in mice. Two groups of mice were employed. One of the groups (group A) received no antibiotic while the other group (group B) received 10 mg/kg of antibiotics. This means that GROUP A is the CONTROL GROUP of this experiment.