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dangina [55]
3 years ago
12

Researchers are conducting a study to determine the effects of vitamin d on the human body. the study involves providing pills t

hat contain vitamin d to one group of human subjects and pills that do not contain the vitamin or other active ingredients to another group of people. the pills that do not contain vitamin d are
Biology
1 answer:
lisabon 2012 [21]3 years ago
3 0
It's called a placebo basically sugar pills.
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c. Magma composition and cooling rate.

Explanation:

A rock cycle can be defined as a concept used to describe the continuous process that leads to a rock's creation, formation, transformation from one form to another, destruction and reformation over a specific period of time. The natural phenomenons that influences the rock cycle are weathering, plate tectonic activity, erosion, etc.

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FLUS Full Time Grades 6-3
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A would be the correct answer I'm sure

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Have a nice day

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