Answer:
A: They maintain stable concentrations.
Explanation:
Hopefully this helps!
Where are the questions so that I can deliver a more accurate answer.
weightlessness is the complete or near complete absense of the sensation of weight.
when in freefall,the only force acting upon your body is the force of gravity a noun contact force.since the gravity cannot be felt without any other opposing forces,you would have no sensation of it.you would feel weightless when in a state of freefall.
