Scientists determine evolutionary relationships between animal phyla using evidence from the a. fossil record. c. animal size. b. number of offspring. d. animal behavior.

The correct answer is - a. fossil record.

Explanation:

Fossil records are the records or list of fossils that are analyzed and placed in order taxonomically. Fossils are very helpful in establishing the evolutionary relationship of the animal phyla by various ays such as the age of a fossil by dating, DNA, or genetic material helps them to determine the evolutionary relationships of various species or organisms. It helps in representing the changes that took place in organisms over the period of time.

Thus, the correct answer is - a. fossil record.

Answer is C.

Explanation:

The sympathetic pathway is the pathway of the sympathetic nervous system. Sympathetic nervous system is a part of the autonomic nervous system , that  comprises of neurons regulating the body's involuntary actions. It is also regarded as the pathway by which organisms respond to stress, because it prepares the body for stress.

The sympathetic nervous system help the body to respond to stress by increasing the rate of the heart beat, activating the release of adrenaline among others.

The other part of the autonomic nervous system is the parasympathetic nervous system, which brings the body to the state of calmness and relaxed feeling after a stressful event. This is done by slowing down the heart rate and increasing the rate of digestion.