Specific heat<span> is how much </span>heat<span> energy is needed raise the temperature of a substance. </span>Water has<span> a very </span>high specific heat<span>. That means it needs to absorb a lot of energy before its temperature changes. </span>Sand<span> and asphalt, on the other hand, </span>have<span> lower </span>specific<span> heats.</span>
<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 two gasses that make up 99% of the earth's atmosphere are nitrogen and oxygen.
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2
I believe the answer is two, since it's H2O.
Hope this helps!
