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The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.
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Why does sexual reproduction result in more genetic variation in a species
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Match each description of an object’s motion with the position-time graph that represents it. not moving moving with constant speed speeding up slowing down
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What changes were caused by the breakup of Pangaea?
a) change in climates as landmasses moved clos...
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