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Astronomers are scientists who study the origin of the universe and its objects and how it works. As an astronomer, you can work in observational astronomy, using telescopes and cameras to look at the stars, galaxies and other astronomical objects, or in theoretical astronomy, where you'll use maths and computer models to explain observations and predictions.

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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. 

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.

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