Roger has been lifting weights seriously for years. his twin brother steven does not exercise regularly. which of the following statements would be a reasonable hypothesis to make regarding differences between their skeletons?

stevens hydroxyapatite combination is less than roger's

roger's skeleton underdoes less osteolysis than steven's

roger's osteoblasts are more active than steven's

all of the listed responses are correct

Roger's osteoblasts are more active than Steven's

Explanation:

Since the osteoblasts are the cells that are going to produce the bones, the lifting weights are going to promote that these cells are active in combination with hydroxiapatite that can reinforce the bones of our body.

In any case there is a sign of osteolysis, if this is a "natural" process, is more common when there is some sympthoms of some illness like cancer.

Hope this info is useful