Substance abuse can spread STIs because when a user shares needles with an infected person, it can spread through the blood. Any high-risk behavior like this spreads STIs.
Answer:
D the train
Explanation:
The train is safe very fast and was the first built
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The answer is serotonin.
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Important muscle electrical signals is the movement of charged material (ions) across cellular membranes in a limited area
I think it is because in the ocean the plankton produces most of the oxygen which is used by aquatic plants and plankton is a primary producer known as autotrops.
