Vitamin d is an organic molecule that regulates the absorption of calcium by the body. which of the following elements is most common in a molecule of vitamin d?

a. aluminum
b. carbon
c. magnesium
d. sodium

Which table best shows the impacts resulting from human activity? impact of human activities human activity impact forest area cleared to construct an airport increase in oxygen level vegetation cleared to construct an oil mine increase in pollution impact of human activities human activity impact forest area cleared to construct an airport increase in sound pollution vegetation cleared to construct a power plant contamination of water impact of human activities human activity impact beehives cleared from urban areas increase in vegetation dams constructed on a river increase in fish population impact of human activities human activity impact beehives cleared from urban areas increase in bird population dams constructed on a river better quality of water

Twind is considered to be an abiotic factor because it.?

What causes darkening of the skin as melanin production increases