Question

1. Why is a system of circulation necessary for organisms?​

Answer 1

Single-celled organisms use their cell surface as a point of exchange with the outside environment. Multicellular organisms have developed transport and circulatory systems to deliver oxygen and food to cells and remove carbon dioxide and metabolic wastes.

Answer 2

Answer:

It is necessary to dilever food and oxygen to all the parts of the body of the organism and to remove wastes products like carbon dioxide and nitrogenous substances.

Explanation:

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