Human activities, such as the burning of fossil fuels, result in air pollution. what could be an outcome if the amount of smoke released is not regulated?
a) sunlight would not be able to reach earth.
b) the temperature of the region would decrease.
c) trees would begin to die, leading to habitat loss.
d) the smoke would settle around cities, reducing visibility.

D) The smoke would settle around cities, reducing visibility.

D option

Explanation:

A is wrong bcoz the amount of smoke is not that much to prevent sun rays to enter.

B is wrong bcoz on burning fossil fuels, co2, ch4 etc increase result in increase the temperature

C is wrong bcoz on burning fuels Co2 release and the C3 plants absorb more Co2 and do more photosynthesis.

This means their activity increase

4. The smoke mix with water vapours make fog..reducing visiblity.

b. the carbon cycle ensures living things have a source of hydrogen

its temperature is increasing. this causes molecular vibrations to increase.