Answer:It ensures the availability of food and oxygen on earth.
Step-by-step explanation:
The process of photosynthesis can be defined as the conversion of light energy into chemical energy.
The carbon dioxide and water comes together to form glucose in the presence of sunlight.
The by-product of photosynthesis is oxygen which is used by the other living part of the earth. The food is also the basic need of life which cannot be replaced by anything else.
Hence, photosynthesis is very important to life on earth.