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Definition
| the system by which oxygen is taken into the body and an exchange of oxygen and carbon dioxide |
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Definition
| a system formed by the interaction of a community of organisms with their environment |
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Definition
| a key used to identify a plant or animal |
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Definition
| alleles whose effect is masked by the activity of the second when both are present in the same cell or organism |
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Definition
| the liquid part of blood or lymph, |
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Definition
| the oxygen-carrying pigment of red blood cells that gives them their red color |
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Term
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Definition
| the part of the nervous system comprising the brain and spinal cord. |
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