Answer:
<em>erosion, physical reactions, chemical reactions, and gravity</em>
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Answer: The control group is the part where you see what happens when you change a variable you want to study/examine. Basically, you need the control group because you need something to see what happens when you change something.
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About 90 percent of the stars in space are Main Sequence stars.<em> (c)</em>
Answer:
first is regular reflection and 2nd is irregular