What role does bacteria play in the environment?

it decomposes dead organisms, fixes nitrogen, and can break down some petroleum. and it can infect something and decrease its chance of survival.

Bacteria plays an important role in the environment. It decomposes dead organisms, fixes nitrogen, and can break down some petroleum. It can also infect 'something' and decrease its chance of survival.

Leaves specifically the gas exchange between plants and the environment. while plants undergo photosynthesis, they also partake in cellular respiration. respiration is the process that happens in the leaves of plants.