A.
This is the highest grade of coal and requires the greatest amount of pressure and time for formation.
Answer:
not enough skin exposure to the sun to make Vitamin D.
Explanation:
The correct answer would be <u>not enough skin exposure to the sun to make Vitamin D.</u>
The body makes vitamin D by being exposed to the sun and this vitamin and its metabolite are quite important in the homeostasis of calcium. Calcium on its own is very essential to the formation of bones in the body.
<em>Hence, when the skin is not adequately exposed to the sun, the body becomes short of vitamin D and this disrupts the homeostasis of calcium and the formation of bones in the body. Thus, osteoporosis, also known as weak bones, may result. </em>
Water molecules and alcohol molecules are polor has a negative and positive end
An amino acid is the building block (or monomer) of proteins :)
Doctor Larry Young describes how neuropeptides can activate circuits that can change emotions and behaviors. ... A neuropeptides is a chain of amino acids that is released either into the blood where it activates receptors in our body, or directly into the brain where it can activate receptors in our brain.