Answer:
Part 1. The amount of calcium is independent variable.
Explanation:
An independent variable is a variable in an experiment which is changed to see its effects on dependent variable.
In this experiment, to know about the causes of osteoporosis, the Ca level in blood or calcium intake in changed.
So the concentration of calcium will be independent variable.
Part 2.
The risk of bone fractures is could be changed with calcium.
Explanation:
In this experiment osteoporosis or risk of bone fracture is dependent variable.
Dependent variable are results of experiment which can be changed by independent variable.
As in experiment, Calcium concentration is independent variable.
So the risk of osteoporosis depends can change with calcium.
Maybe A, B, and D, this could be wrong but my best guesstimate
Answer:
Compare autotrophs to heterotrophs, and describe the relationship between these two groups of organisms. Autotrophs make their own energy, while a heterotroph must eat another organism to be able to get energy. ... Once the energy flows from the system it gets recycle for future use in other organisms.
Answer:
B
Explanation:
Permeability is the property of a cell membrane that allows materials to pass through.
