What is the fate of most solar energy when it enters earth’s atmosphere?

a) it’s reflected back into space by the atmosphere.
b) it’s backscattered to space by the atmosphere.
c) it’s absorbed by earth’s surface.
d) it’s reflected by land and ocean surfaces.
e) it’s reflected by clouds

The chemical form of energy that is useable by the cell to do work

Which of the following is a testable hypotheses?

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.