Reading Chapter 15
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. The separation of populations by barriers such as rivers, mountains, or bodies of water is called
____ 2. Most fossils form in
____ 3. The three-domain system recognizes fundamental differences between two groups of
____ 4. A pattern in which species experience long, stable periods interrupted by brief periods of rapid evolutionary change is called
____ 5. A genus is composed of a number of related