Select the correct answer from each drop-down menu. In an experiment, Dr. Travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. The amount of calcium is what
variable. The risk of bone fractures can be changed by what?
.

By consuming necessary amount of calcium per day.

Explanation:

The amount of calcium is recommended for adults are 1000 mg per day whereas for aged people, it should be 1200 mg per day and for children it becomes 1300 mg per day in order to make the bones stronger and avoid the risk of fracture. The risk of bone fractures can be changed by consuming the recommended amount of calcium through your diet.

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

and after water is usually warmed by the sun the water temperature raises and then evaporates .