Two species of frogs do not interbreed because one species breeds in March and the other species breeds in May. This is an example of
A. allopatric speciation.
B. a postzygotic reproductive barrier.
C. a prezygotic reproductive barrier.
D. sympatric speciation.
Answer: C
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In 1845, the human population of Ireland experienced a major crash as a result of
A. the plague. B. the potato fungus. C. an influenza epidemic. D. a prolonged drought. E. HIV/AIDS.
If a rock is poorly sorted, this means the rock contains
A. some parts that are reddish and others that are not. B. a great variety of rock types as clasts. C. mostly sand. D. a wide range in the size of clasts. E. some angular and some rounded clasts.
The first jawed fish were the
a. placoderms. d. chondrichthyes. b. acanthodians. e. agnatha. c. ostracoderms.
La Niña results in colder-than-normal surface waters in the Eastern Equatorial Pacific Ocean and generally causes below-average rainfall in most of North America.
Answer the following statement true (T) or false (F)