In the deductive reasoning behind the claim that "If firms sell homogenous products, then prices should fall to marginal costs" the role of "firms sell homogenous products" is:
A. an assumption.
B. a method of proof.
C. the sample.
D. a conclusion.
Answer: A
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In experiments to test apical dominance, researchers found that:
A. if the shoot tip is cut off and auxin is applied, the axillary branch will grow. B. if the shoot tip is cut off and treated with a substance that inhibits auxin transport, the axillary branch will grow. C. if the shoot tip is cut off and cytokinins are applied, the axillary branch will grow. D. if the shoot tip is cut off and treated with something that inhibits cytokinin transport, the axillary branch will grow. E. branching is enhanced by the movement of auxin from the shoot tip toward the root.
A population of wolf spiders exemplifies a
____ population distribution. a. clumped b. random c. uniform d. constant e. homogeneous
The mesophyll layer of leaves is important to plants because
A. it keeps the plant from drying out. B. it anchors the plant to the soil. C. most of the photosynthesis occurs here. D. most of the water needed for photosynthesis is absorbed here.
The respiratory advantage provided by a four-chambered heart over a three-chambered heart in vertebrates is
What will be an ideal response?