Dont mind the top part, hope this helped
Below are the choices that can be found from other sources:
A. change in climate
<span>B changes in the atmosphere </span>
<span>C changes in the fossil record </span>
<span>D changes in volcanic
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The answer is <span>C. changes in the fossil record
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Helpful friction would be the friction on something that you wanted to stop (a car) while unhelpful friction is friction on something that you want to keep going (a curling rock)
