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.
The first jawed fish were the
a. placoderms. d. chondrichthyes. b. acanthodians. e. agnatha. c. ostracoderms.
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.
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)