What happened between 10 and 5 million years ago that favored the evolution of primates that were bipedal and no longer tree-dwellers?
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During this time period, the climate cooled and became drier. The huge tropical forests receded, giving way to savanna. If human precursors were bipedal, they could stand up higher and see out onto the savanna. This feature would enhance their hunting and survival abilities, and thus it evolved. Once human ancestors expanded out onto the savanna, they lived on the ground.
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Nucleotides are found in
a. proteins. b. steroids. c. lipids. d. ATP, DNA, andRNA. e. carbohydrates.
Each year, the direct and indirect costs of psychiatric and neurological disorders in the United States amount to about:
A) $40 billion B) $400 million C) $400 billion D) $40 million
Male sex hormones are
A. androgens. B. estrogens. C. gonads. D. semen.
The oily substance that lowers the pH of the skin's surface to about pH 5 and is inhibitory to many bacteria is (sebum/sweat/serum)
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