Which statement identifies a characteristic of a scientific theory?
a. it’s a subjective
b. it’s a proven fact
c. it’s based on a opinion
d. it may change over time

The correct answer is B it"s a proven fact.

Explanation:

Any scientific theory is based upon many experiments ans observations.The experiment and observations are repeated many times to provide a scientific logic about that theory.

   A scientific theory is accepted only when that theory is logically proved by various experiment ,observations,statistical analysis etc.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

thats a little if u want the answer just look it up on google thats what i do haha : )