Natural selection requires that individuals in a population are
oa. small in size.
ob. exactly identical.
c.
genetically diverse
od.
only physically different.
reset
subod

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?