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to question two  When plant roots grow downwards, it is an example of positive geotropism, because they are growing towards the stimulus, the soil. However, when plant shoots grow upwards, it is an example of negative geotropism as they grow away from the stimulus, the soil.Feb 21, 2018

Explanation:

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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a

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