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| Plant hormone that inhibits growth, closes stomates during times of water stress and counteracts breaking of dormancy |
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| Nonliving and includes temperature, water, sunlight, wind, rocks, and soil. |
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| The process of leaves falling off a tree or bush. |
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| One of many neurotransmitters |
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| Caused by pollutants in the air from combustion of fossil fuels. The pH is less than 5.6 |
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| Thin protein filaments that interact with myosin filaments in the contraction of skeletal muscle. |
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| A rapid change in the membrane of a nerve or muscle cell when a stimulus causes an impulse to pass. |
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| The type of immunity when an individual makes his or her own antibodies after being ill and recovering or after being given an immunization or vaccine |
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