Which one of the following is an important evolution concept that helps prevent organisms from mating across species boundaries?
a. hybrid formation
b. postmating isolating mechanisms
c. geographic isolation
d. natural selection
Ans: d. natural selection
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If the pH of the mouth becomes more acidic, which of the following is true?
a. All food types are broken down chemically. b. Amylase function decreases. c. Pepsin starts breaking down proteins. d. Amylase function increases.
In __________, an anus forms first
Which of the following describes the most important difference between invertebrates and vertebrates?
a) invertebrates contain multiple tissues, while vertebrates do not b) vertebrates contain a backbone, while invertebrates do not c) invertebrates contain a backbone, while vertebrates do not d) vertebrates contain multiple tissues, while invertebrates do not
The portion of a nerve cell that carries nerve impulses away from the cell is the
A. dendrite. B. cell body. C. axon. D. glia.