Steroid hormones are derived from

a. free fatty acids.
b. cortisol.
c. tyrosine.
d. cholesterol.
e. alanine.


D

Biology & Microbiology

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Which one of the following animals would most likely be defined as a keystone species?

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If scientists were able to identify a specific gene mutation that was strongly correlated with

bladder cancer in dogs, this might be considered a __________.

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Which statement does not represent one of Darwin's observations?

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Which of these gases was absent in the early Earth atmosphere at the time life first appeared?

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Biology & Microbiology