What material is compressed underground to form fossil fuels

The correct answer is option A (Dead plants and animals).

Explanation:

Fossil fuels are hydrocarbon-containing materials like natural gas, fuel oil, coal which act as a source of energy. These fossil fuels are formed from the remains of dead animals and plants of Carboniferous Period about 360 to 286 million years ago.

At that time the remains of plants and animals along with micro-organisms were decayed which were later covered by sand and silt and trapped it under the rocks. Over time heat and pressure compressed it and changed it into coal, oil and some trapped pockets of gases known as natural gas.

Thus, option A (Dead plants and animals) is the correct answer.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

answer; i believe the correct answer is (a)0