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An autotrophic organism can produce its own food from simple substances such as carbon dioxide, generally using energy from light or inorganic chemical reactions.

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The pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals (roughly 146959 pounds per square inch).

In evolution, adaptation is a change that makes an organism better suited to living in its environment. 

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In evolution, adaptation is a change that makes an organism better suited to living in its environment. 

Part of the immune system that responds to specific antigens.

Moving in the opposite direction of the hands on a clock.

The protective liquid contained by the amniotic sac.

Part of the immune system that responds to specific antigens.