Answer:
An arctic fox changes its fur color to blend in with its surroundings
Explanation:
This is a defense mechanism because when it blends into its surroundings it can hide from its predators and help defend itself
Darwin's opinion that living forms must be descended from extinct forms was most closely related to his consideration of the fossil record.
Answer:
B) Neurotransmitters
Explanation:
The function of a neurotransmitter is either to excite or to inhibit the firing of brain synapses and thus to stimulate or mute brain activity. Some neurotransmitters have a general effect, while others have more specific roles in the brain.
A variable.
In an experiment, it is important that everything is exactly the same in order to achieve correct results. The only exception are the variables, the independent variable and the dependent variable.
