The skin plays a role in the production of vitamin D because when dehydrocholesterol reaches the skin by means of the blood and is exposed to ultraviolet light from the sun, it changes to vitamin D in an inactive form.
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Answer:
The movement is caused by the convection currents that roll over in the upper zone of the mantle. This movement in the mantle causes the plates to move slowly across the surface of the Earth.
Explanation:
The ureter is the tubes that connect the kidneys the the bladder
The urethra is the exit point for excess water that goes through your ureter
Chlorophyll,makes the plant green. large central vacuolestores the water. , cell wall protects the membrane
