Question

the only 'producers' on earth

Answer 1

Plants are the only producers on the earth

Answer 2

Answer:

The "only producers" on the earth are "plants". Earth is a large ecosystem with millions of interlinked food chains. However the "primary level of food chains" are the plants which produce food using inorganic materials through the process of "photosynthesis". The plants use the sun's energy to produce their own food in the form of sugar or glucose. This energy then gets transferred to higher level of food chains through organisms which consume producers.