As far as I know, the adrenal glands, when submitted under pressure such as the one described in the example, secrete a substance known as epinephrine which has the tendency of increasing the affected person's heart rate and breathing.
Answer:

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Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. ... Scientific laws summarize the results of experiments or observations, usually within a certain range of application.
Answer:
used to observe small objects, even cells
Explanation:
The image of an object is magnified through at least one lens in the microscope.
Yes decaying plants add carbon to the soil