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| Nonliving environmental factors. |
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| Method used to determine fossil age by radioactivity. |
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| Neurotransmitter produced by the terminal branched of nerve cell. |
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| Compound forms hydrogen ions lacking a electron when dissolved in water; pH less than seven. |
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| Gene mutation; chromosome mutation. |
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Definition
| Cellular respiration that requires oxygen and takes place in the mitochondria. |
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Definition
| One of two kinds of genes for a trait. |
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| Organic compound that is the building block of proteins. |
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| Cellular respiration that does not require oxygen and takes place in the cytoplasm outside the mitochondria. |
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Definition
| Structures that are similar in function but dissimilar in construction and evolutionary development. |
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Definition
| Part of the stamen of a flower and the producer of pollen grains. |
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Definition
| Phylum in kingdom Plantae that includes flowering plants that usually reproduce by seeds hidden inside fruits. |
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Definition
| Substance produced by some bacteria or fungi that can destroy bacteria but not viruses. |
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Definition
| Protein in the blood that can help fight disease by destroying harmful substances such as antigens, bacteria and viruses. |
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Definition
| Side of tRNA that is complementary to the codon on an mRNA molecule. |
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Definition
| Domain that includes prokaryotic unicellular organisms with cell walls lacking peptidoglycan. |
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