The correct answer would be A. The agent of metamorphism that would cause for the overall composition of a rock to change would be hydrothermal solutions. These solutions contain mineral substances that are dissolved in the hot water. When in contact with a rock, the minerals may change the composition of the rock.
The answer is true. Melatonin is a hormone that is created by the pineal
gland<span> in animals and controls sleep and alertness. It<span> seems
to have 2 possible interacting effects on the sleep-wake cycle. First, it encourages
sleep and stability in a “hypnotic” function by escalating the homeostatic coerce
to sleep. Second, it entrains and modifies the process c in a “chronobiotic”
function.</span></span>
Only a little of the equator gets to experience day and night. When Uranus revolves around the Sun one part gets light and day while the other gets light and darkness. So it changes because one time you can be looking and its day. Then you will look again and it will be night since Uranus moved around the Sun.
The two enviromental conditions that can cause a seed to become dormant are
1) When a volcano erupts.
2) When it gets very cold in winter.