* For most of human existence, the population grew slowly because
1
A) food was scarce.
B) predators were abundant.
C) disease killed many people.
OD) all of the above

inadequate in vitamin D and excessive in calcium

Explanation:

Vitamin D plays a significant role in the regulation of calcium and maintenance of phosphorus levels in the blood. These factors are vital for maintaining healthy bones. People need vitamin D to allow the intestines to stimulate and absorb calcium and reclaim calcium that the kidneys would otherwise excrete.

Foods that provide vitamin D include:fatty fish, like tuna, mackerel, and salmon.

Foods fortified with vitamin D, like some dairy products, orange juice, soy milk, and cereals.

Beef liver.

Cheese.

Egg yolks.