Heat Convection. Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises (see Ideal Gas Law).
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Water itself does not live. Water does not need sustenance of any sort to continue to function and it does not pass on any sort of DNA to any build a future generation so it is not biotic.
<em>Tiktaalik and Acanthostega are early tetrapods that do not have features unique to fish.</em>
