Question

why we compare arteries like tree which devides into smaller and smaller branches

Answer 1

It is so because, both of them are divided into small branches.

Answer 2

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Arteries carry blood to different parts of our body. They divide into branches called capillaries to supply blood to even small organs. So, we compare arteries with tree that divides into smaller and smaller branches.

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Hope it helps... ¯\_(ツ)_/¯