Question

Why there are ants on Earth?
Why there are bacterias on Earth?

Answer 1

Answer:

As we are for no reason thry are also.

Answer 2

Answer:

Ants act as decomposers by feeding on organic waste, insects or other dead animals. They help keep the environment clean. Carpenter ants, which make their nests in dead or diseased wood, considerably accelerate the decomposition process of timber.

2nd Answer

Bacteria were widespread on Earth at least since the latter part of the Paleoproterozoic, roughly 1.8 billion years ago, when oxygen appeared in the atmosphere as a result of the action of the cyanobacteria.