Adaptive radiation is the rapid emergence of many species from a single species that has been introduced to ________.

Living things are classified largely in accordance with degrees of ________.

All species are referred to by a two-part name, the first part of which is a species’ ________.

Under the biological species concept, species members are defined by their ability to ________ with each other in nature.

Name as many intrinsic isolating mechanisms as you can.

The critical factor leading to speciation is reduced ________ between two ________ of the same species.

The mule provides an example of the intrinsic isolating mechanism of hybrid ________.

Two factors always play a part in allopatric speciation: first, the development of ________ and second, the development of one or more ________.

Sympatric speciation is speciation that does not involve ________.

Living things are classified into a set of hierarchical categories. Why is this more useful to biologists than simply giving everything a one-word name (or a number) and eliminating some of the categories?

In the biological species concept, the factor that defines a species is:

a. geographical separation.

b. reproductive isolation.

c. hybridization.

d. cladogenesis.

e. its behavior.