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a relationship between two kinds of organisms that benefits one without harming the other
any patterns formed by groups of stars in the night sky. To people in the past, these patterns looked like pictures of animals or people
the flow of heat through a liquid or gas, caused by hot parts rising and cooler parts sinking
the rocky surface that makes up the top of the lithosphere and include the continents and the ocean floor
a relationship between two organisms of different species where one benefits and the other is harmed
A green chemical in plant cells that allows plants to use the Sun's energy to make food.
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