At first you have to write the variables out which are

now you have to combine like terms


now you add these two variables and end up with answer of
I’m pretty sure he or she is correct ^^
Answer:
Agriculture is the basic source of food supply of all the countries of the world—whether underdeveloped, developing or even developed. ... Raising supply of food by agricultural sector has, therefore, great importance for economic growth of a country.
The temperature decreases in the mesosphere since there is no ozone and the amount of air is decreasing.
I hope that this helps :)
Answer:
mid-elevation hills and valleys.
Explanation: