Plants convert
a. sunlight to chemical energy
b. chemical energy to mechanical energy
c. sunlight to mechanical energy
d. mechanical energy to chemical energy

option A

Explanation:

The correct answer is option A                                        

Plants convert sunlight into chemical energy.                      

Photosynthesis is a process that is used to convert sunlight into chemical energy using protons and electron from the water.                

Sunlight is used by the plants to convert the water and carbon dioxide into energy-rich sugar known as glucose.

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.