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mihalych1998 [28]
3 years ago
15

Air pollution is caused by A. the sun. B. heavy rainfall. C. human activities but not natural events. D. natural events and huma

n activities.
Biology
1 answer:
Anna71 [15]3 years ago
6 0

Answer:

D . natural events and human activity

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What term is used to describe a substance given in clinical trials that does not contain the drug?
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Answer:

Placebo, Is used to describe a substance given in clinical trial that does not contain the drug.

Explanation:

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  • A placebo contains all the components as the medicine except for the drug that is being tested.
  • A placebo is given to one group of patients having the symptoms for which the drug is tested while another group of patients with same symptoms are given the drug.
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ocean water evaporates and becomes water vapor, then when the droplets grow larger they fall as precipitation

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Release it through the lungs.

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