No organism can manufacture elements, such as calcium, magnesium, and phosphorus, so where do humans get them

We can obtained it by a healthy and well-balanced diet.

calcium - milk, yogurt and cheese etc
magnesium - bananas and avocados etc
phosphorus - meat products (steak, salmon etc)

To see a general view of a microscope slide, use low power. to see a more specific and detailed view, use high power.

Processes above and be sure to mention the movement of electrons and energy as the carbon atom moves from one reaction to another.