Which is the best example of a response to an external stimulus?

drinking water after a long run
avoiding the sun by looking for food at night
a hungry bear hunting for food
falling asleep in the treetops of a forest

Answer:

its a or b most likely a tho

Explanation:

Answer: B

Explanation:

A human disease termed cardioencephalomyopathy results from a genetic change in the normal function of mitochondria. Babies who are born with the disease generally die from it. Scientists who study this disease using a bacterium known as Paracoccus denitrificans. Scientists were able to produce the same change in the bacterium’s genes that they found in the mitochondria of their human patients.


What is the BEST explanation for why scientists can use a bacterium to study this human disease?

A
Bacterial genes are very similar in structure to human genes.
B
Bacteria can be used as a model to study more complex cells.
C
The genes and chemical pathways found in bacteria are similar to those in human mitochondria.
D
The eukaryotic cells of humans share many characteristics with bacterial cells, including single stranded DNA.

Couples who both have normal colour vision and have a child with colour blindness. Explain how this may happen, and state that the sex of the colour blind child must be.​
Please help me

Which statement describes landforms

Use the same article to answer the following questions. Muscle Contraction What happens if there is not enough ATP available?

Where do living things get their traits?

Select the correct answer.
Which part of the brain controls functions such as eye movement, body movement, and vision?
Α.brainstem
B.forebrain
C.midbrain
D.hindbrain

What happens in the gray zone between solid and liquid? Can we find a unified theory of physics?

Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry at least one recessive allele, but neither of them has cystic fibrosis. Which statement reflects the likelihood of a child of these parents having cystic fibrosis?
The child cannot have the disease because only the dominant alleles will be passed on.
The child will have the disease because only recessive alleles will be passed on.
The child may or may not have the disease because a recessive gene from each parent may be passed on.
The child may or may not have the disease because the disease does not depend on the alleles of the parents.

In the wild, are all organisms likely to survive?________

what consists of 2 protons and neutrons and is positively charged

Given RRYY x Rryy, what will the parents be? Help (real answers only please)

A “flight or fight” response occurs when the body perceives a type of threat. The hormone known as adrenaline is released which will affect a variety of body systems. Which system needs to increase its activity in order for the muscular system to respond to the perceived threat?

A)Endocrine
B)Integumentary
C)Excretory
D)Digestive

An organism's phenotype depends on what?
A. Father's DNA
B. Genotype
C. Environmental factors
D. Genotype and Environmental factors

In the investigation of oxygen dynamics in E. chlorotica cultures,
gross photosynthesis is reported after seven months in culture, even
in the apparent absence of oxygen production.
Which statement provides the best reasoning to explain this
observation?
A. The oxygen produced in photosynthesis is used in cellular respiration.
B. Photosynthesis can be sustained in the absence of oxygen production.
C. The plastids store oxygen for use in photosynthesis.
D. The ability to carry out photosynthesis is transferred from the
chloroplast to the mitochondria.

Which statement is true about gravitational forces?
A.
Every mass exerts a gravitational force on every other mass.
B.
Only masses of equal size exert a gravitational force on each other.
C.
Only moving masses exert a gravitational force on stationary masses.
D.
Only large masses exert a gravitational force on small masses.

Desmond is wearing a purple shirt to school. Which colors are being absorbed by the shirt to make it look purple? A purple, blue, yellow, red, and green B red, orange, yellow, green, and blue C blue, purple, red, green, and orange D orange, yellow, blue, purple, and green

which of the following is not a virus?

PLEASE HELP! i inserted a pic will give brainliest if right

factors influencing soil formation​

ill give brainly pls help

Which Asexual reproductive strategy involves dividing in two and regrowing into a separate organism
A. Budding
B. Parthenogenesis
C. Fragmentation
D. None of the above​

The wing of a bee and the wing of a bird are considered to be - A B s C D

A.) Vestigial structures
B.) Homologous structure
C.) Analogous structures
D.) Evolutionary structures

what is osmosis ANSWER FAST

Analyze
1. What are the biotic and abiotic factors the scientists monitor which influence this
bat population?

Three of these could be grouped into a similar category. Which one does not belong. Explain why? brain, liver, skin, and femur

Meteorologist often talk about warm fronts and cold fronts and how they contribute to various weather conditions like storms, what is a front?

The career of Jacques Cousteau illustrates that

values can shift over the course of a career

focusing on a single task is the best strategy for change

only highly educated people can raise environmental awareness

publicity plays an insignificant role in advancing a scientist's causes

Needdd helllppp

A cold, dry air mass collides with a warm, humid air mass over the land. The warm air mass is forced upward quickly. As the air rises, it cools and condenses. What type of weather phenomena is forming?
A.
a hurricane
B.
a tsunami
C.
a thunderstorm
D.
a flood

I need an answer for Question 4 please:)

need this please thanks