During which process does heat transfer occur because of density differences in water or air? A. Conduction
B. Pollution
C. Radiation
D. Convection
2. Explain your answer.

D. Convection

Explanation: As water's temperature increases in the presence of a heat source, it will become less dense and rise. As it moves up and away from the heat source, it cools and becomes denser and sinks.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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trachea, alveoli, lung capillaries, arteries