Why is it difficult for your body to return blood from your feet when you sit for too long?. Single choice. a. Blood has to travel a greater distance. B. Skeletal muscles are not squeezing the veins. c. Gravity makes the blood flow backward. d. The heart does not beat fast enough at rest.
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Biology, 22.06.2019 19:10, isabellawest2
which is an effect of short-term environmental changes? a) adaptation b) speciation c) extinction d) death (5 points)
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Why is it difficult for your body to return blood from your feet when you sit for too long?. Single...
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