Give reason for the following:
a) Arteries are thick walled.
b) Blood goes only once in one cycle through the heart in fishes.
c) Plants have low energy needs.
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Answer:
arteries have thick wall bcz in artries bp is high
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arteries have thick wall to pump blood to the remotest parts of bodies
blood goes once in one cycle through the heart in fishes becoz the have only systematic blood system
plants have low energy needs becoz they make their own food and doesn't require energy to do things
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