Each human has a total of about _____ genes.

A basic nerve cell in the central nervous system is called a(n) “_____.”

Individual A’s 23rd pair of chromosomes is XX. Individual A is _____.

_____ is the thick, high-calorie fluid that is secreted by a new mother’s breasts in the days immediately following birth.

Any consequence that follows a behavior and makes a person likely to repeat that behavior is called a(n) “_____.

The ______ is composed of the ethmoid bone and vomer.

Tissue death is called:

A cation is positive.

Body weight is stable when average daily energy intake and output are equal. 

What is the red arrow pointing at?