In the first half of the twentieth century, which two opposing theories dominated the discipline of psychology?

Regarding exposure to teratogens, which of the following affect when a threshold is crossed?

Pruning is the process by which _____.

Most of the known single-gene disorders are _____.

Jenny just learned that she is 6 weeks pregnant. She is in the _____ period of prenatal development.

The most common extra-chromosome condition is _____.

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

Each human has a total of about _____ genes.

The central nervous system includes the ____ and _____.

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