Which detail contributes to a dominant impression of danger?
smooth, glassy water
waves gently lapping the shore
rocks like jagged teeth
dazzling, sun-baked sand

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What are 3 reasons that natural selection occurs

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d