What type of cell does HIV infect?
A. helper T cells
B. B cells
C. red blood cells
D. phagocytic cells
E. All of the answer choices are correct
A. helper T cells
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The pair of traits that best illustrates convergent evolution is
A. an elephant's tusks and a beaver's teeth. B. a lizard's arm and a bird's wing. C. a dragonfly's wing and a butterfly's wing. D. a cartilage skeleton in a shark and a bone skeleton in a dolphin. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about convergent evolution? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Antibodies are made by
A. red blood cells. B. macrophages. C. B cells/plasma cells. D. T cells.
Regardless of its shape, a given orbital may contain no more than:
A. 8 electrons. B. 4 electrons. C. 1 electron. D. 2 electrons.
Homplastic traits are similar for reasons other than those due to inheritance from a common ancestor
a. true b. false