Answer:
it's necessary because your body uses water in all its cells organs and tissue. water helps you to keep moving and functioning.
<span>In marine vertebrates, the gill arches use the external gas exchange. The water holds less oxygen.
The ribs in terrestrial vertebrates have enclosed respiratory surface which is inside the body and comes as paired lungs.
Kidneys are efficient in excretion of regulation of water and nitrogenous wastes. Their reproduction is normally sexual with separate sexes.</span>
The mouse; because the fish might decompose much faster, because it would be in water
Your missing the blank but there is what you are looking for.
<span>An experiment that fails to prove a hypothesis will often provide a new direction for the researcher.
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