The correct answer is:
A. A group of related parts that work together to achieve a desired result.
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Because it remove the green pigment chlorophyll present in it.
We boil the leaf in alcohol when we are testing it for starch because to remove the green pigment chlorophyll present in it. For the starch test, we need to observe the colour change from brown to blue when iodine is put on the leaf.
I don’t see any graph but what could’ve caused evolution could’ve been food, water, or shelter. But most likely food.