"which of these is a tropic hormone secreted by the anterior pituitary gland

Tropic hormone are produced by the anterior pituitary gland and are hormones that control the activities of other endocrine glands. The anterior pituitary gland relies on regulatory hormones that come from the hypothalamus to tell it when to make and secrete its own hormones.

this process is called "phosphorylation." a phosphate bond joins adenosine diphosphate to form adenosine triphosphate.

i'd say that the moon rock is about 2.2 billion years old.