Based on this picture, which observation can be made about leaf-cutter ants?
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a. leaf-cutter ants have stingers for defense against predators.
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b. leaf-cutter ants can destroy an entire tree.
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c. leaf-cutter ants move in large numbers.
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d. leaf-cutter ants can carry objects larger than themselves.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.