Ascientist read about an experiment done by someone else. she does the same experiment in her lab to make sure it works.
this is an example of

The correct answer will be- repetition of the experiment to test the hypothesis

Explanation:

A scientific experiment is performed to test the hypothesis which checks whether the hypothesis is true or not true.

Testing the hypothesis is the key of the scientific investigation so the repetition of the experiments is done to check the validity of the hypothesis either by the same researcher who formulated the hypothesis or another researcher who check and verify the results.

Thus, the repetition of the experiment to test the hypothesis is the correct answer.

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.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.