plays a role in nearly all aspects of human behavior, personality, and mental processes.

Heredity.

Explanation:

Heredity refers to the traits or characteristics that is passed genetically from the parents to the offsprings or passed from one generations to another. It can be through sexual or asexual reproduction.

Heredity play role in our behavior, personality and mental processes because these all are determined by the traits or characteristics we inherited from our parents.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.