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 variable. the risk of bone . 1. a reliable an independent a dependent 2.can be changed by the participants can be changed by the researcher could change with calcium

Osteoporosis refers to an ailment characterized by reduced bone mass and loss of bony tissue that may lead to weak and fragile bones. In an experiment, Dr. Travis tested the influences of the consumption of calcium on osteoporosis, the condition that results in enhanced chances of bone fractures.  

In the given experiment, the amount of calcium is the independent variable, and the risk of bone fractures could get changed with the amount of calcium consumption.  

The amount of calcium is independent variable.

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.

The risk of bone fractures is could be changed with calcium.

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i think it is dna, i'm not totally sure but i think it might be.