Question

why do animals and humans have a circulatory system​

Answer 1

Answer :

Multicellular organisms have developed transport and circulatory systems to deliver oxygen and food to cells and remove carbon dioxide and metabolic wastes.As well as Transport systems are crucial to survival. Unicellular organisms rely on simple diffusion for transport of nutrients and removal of waste. Multicellular organisms have developed more complex circulatory systems. Hence, Animals and Humans have a circulatory system.

Additional information :-

Nutrients, oxygen and hormones are delivered to every cell and as these necessities are provided, waste products such as carbon dioxide are removed, according to the nonprofit Nemours Children's Health System.

There are 3 Kinds of Circulation:

•Systemic circulation.

•Coronary circulation.

•Pulmonary circulation.

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