The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide? (4 points) A) Carbon and oxygen are chemically bonded in it.
B) Carbon and oxygen retain their original identity in it.
C) It can be separated into carbon and oxygen using physical methods.
D) The proportion of carbon and oxygen is different in different samples of the gas.

Explanation:

I hope it's helpful for you ☺️

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.

the answer is b & c i believe : )