An ecologist counts the number of individuals in five samples of equal area for four species of organisms. Which of these counts best represents a clumped population?
A) 23, 21, 25, 22, 18
B) 133, 124, 113, 128, 119
C) 47, 18, 93, 12, 28
D) 12, 13, 12, 13, 11
C
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Which of the following atoms cannot participate in biological hydrogen bonds?
A. nitrogen B. oxygen C. carbon D. both nitrogen and oxygen E. both oxygen and carbon
The chemical defense system that complements the immune system and supplements the inflammatory response is known as the ____________________ system
Fill in the blank(s) with correct word
Secondary growth (thickening) arises from ____________________. Fill in the blank(s) with the appropriate word(s)
What is one of the most important survival mechanisms of tubercular bacteria within the body?
A. Eludes killing by the alveolar macrophages (white blood cells of the lung) by preventing fusion of lysosomes with the phagosome B. Eludes the immune system by killing the white blood cells wuickly C. Eludes killing by alveolar macrophages by secreting a toxin that kills these cells D. Eludes the immune system by constant changing protein coats (antigens)