Environment related opportunities for service include lake cleanup. The correct option among all the options that are given in the question is the first option or option "a". There are several other types of services also related to environment. I hope that this answer has come to your help.
Answer: B. Dictatorship
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Please correct me if I'm wrong!!... :3
Wind erosion is the main cause. And since it is the desert that wind can pick up tiny sand rock particles that slowly grind against the rock. Over time the erosion will give a jagged rock the smooth features as if it had been submerged in a river for the roughly same period of time.
He could give each of his children a third of what stamps he owns. So then you would divide 45 by 3 to get how many each child would get.