The activities of macrophages
A. stimulate lymphocytes to carry on specific immunity.
B. stimulate phagocytic neutrophils.
C. are part of the nonspecific response against disease.
D. do none of these things.
E. are part of the nonspecific response against disease and stimulate phagocytic neutrophils.
Answer: E
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A scientist is studying several areas along an elevation gradient. Her study involves prescribed burns (purposefully set, low-intensity fires) in the different areas, followed by a comparison of the type and abundance of organisms that colonize them over the next ten years. What scale best describes her study?
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An example of a modern-day jawless fish (agnathan) is a
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