Apossible explanation of or answer to a scientific question that is based on prior knowledge or research and is testable is called a O law.
O hypothesis.
O theory.
O experiment.

The correct answer is hypothesis.

Explanation:

The hypothesis can be defined as a provisional prediction or explanation (as long as it is not tested) of the relationship between 2 or more variables. Thus, the problem-question precedes the hypothesis-answer which, in turn, derives from the objective (s) of the research.The hypothesis, as a formulation that raises a presumed relationship, can be expressed in the form of a proposition, conjecture , assumption, idea or argument that is temporarily accepted to explain certain facts.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.