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When a seed germinates, its root grows downward in response to gravity. This is called _______. A. thigmotropism B. negative tropism C. gravitropism D. phototropism

When a seed germinates, its root grows downward in response to gravity. This is called _______. A. thigmotropism B. negative tropism C. gravitropism D. phototropism
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When a seed germinates, its root grows downward in response to gravity. This is called _______. A. thigmotropism B. negative tropism C. gravitropism D. phototropism

User Peter Nunn
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Gravitropism is your answer. 
User Alec Holmes
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