According to the biological species concept, speciation consists of the evolution of biological barriers to gene flow. The most important distinction is between _______ and _______ barriers.

The term holophrase is used to denote:

From the overview animation about speciation, which trait was suggested as a reproductive isolating mechanism in the anolis lizards? 

What is the name of the thick, high-calorie fluid which is secreted by a new mother’s breasts for a few days following birth?

A baby searches the faces of her parents to see how to respond in unfamiliar situations.  This is called:

Research on SIDS has shown that babies should be:

When newborns are held horizontally on their stomachs, their arms and legs stretch out.  This response is known as the:

In comparison with genetic drift, evolution by natural selection is

Which of the following is not an assumption of the Hardy-Weinberg theorem?

By transferring neural crest cells from a duck to a quail and vice versa, Schneider and Helms demonstrated that