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| ability of an organism to keep conditions inside the body the same, even though conditions in its external environment change. |
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| Two or more elements chemically combined. |
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| A star that is the center of a planetary system. |
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| Maintaining a relatively constant and warm body temperature independent of environmental temperature; homeothermic. |
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| Animals that use their behavior to help maintain homeostasis. |
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| process in which simple food substances such a glucose are broken down and the energy they contain is released. |
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| signal to which an organism reacts; change in the environment |
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| pure substances that cannot be seperated into simpler substances by ordinary chemical process. |
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| A nonmetallic element occuring in many inorganic and in all organic compounds, existing as graphite and diamond and as a constituent of coal, limestone, and petroleum, and capable of chemical self-bonding to form a number of important molecules. |
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| nucleic acid that stores the information needed to build roteins and carries generic information about an organism. |
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| reproduction requiring only one parent. |
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| hypothesis that states that life can spring from nonlving matter. |
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| some action or movement of an organism brought on by a stimulus. |
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| basic unit of struccture and function in living things. |
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| A scientist that produced the basic building blocks in life. |
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| process by which organisms use energy from sunlight to make their own food. |
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