Darwin was influenced by an essay on human population and food supply written by:
A) Alfred Russel Wallace. B) Joshua Beagle.
C) Charles Lyell. D) Thomas Malthus.
Answer: D
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What is the key concept addressed by the question?
What will be an ideal response?
The Widal test is used for diagnosing salmonellosis.
a. true b. false
Your patient has pneumonia. Since there are so many microorganisms causing pneumonia, what might be the best test to do first for identification of the agent?
A. A skin test B. An antibody test C. A Gram stain of a saliva specimen D. A culture from a lung aspirate
Photoperiodism is the
a. duration of flowering in a plant. b. amount of light needed by a plant to exhibit normal growth. c. response of a plant to the duration of light and darkness. d. light phase of photosynthesis during which photolysis of water occurs. e. opposite of photorespiration