Most babies learn to grasp and hold onto objects by about _____ months old.

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

The areas at the very front of the cortex _____.

Most developmental psychologists believe that development is the result of _____.

The age of viability occurs at about ____ weeks after conception.

_____ refers to all the environmental influences that affect development after conception.

The type of conditioning that Skinner identified is referred to as “_____ conditioning.”

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 _____.