“They” in the second paragraph refers to __________.
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3 .What is the main idea of the passage?
A Birds are widely studied because they are popular in the home. B Ornithology has made important contributions to biology. C Professional biologists often engage in bird-watching for recreation. D Animal behavior is best studied by observing birds.
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A Their ecological value B Their appealing habits C Their visibility D Their beauty
7 .David Lack’s research contributed to biological science specifically in the area of ____.
A evolution B mating behavior C animal demography D immunology
8 .What does the passage mainly discuss?
A The elements of salt B The bodies of water of the world C The many forms of ocean life D The salinity of ocean water
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