Why would life on Earth be impossible without the activity of bacteria?

A reducing link in the biosphere, they recycle dead organic matter. If there were no bacteria, the Earth would be covered with a pile of dead matter, and we would simply drown in it. The second reason is that the processing goes to an inorganic substance. If there were no bacteria, inorganic substances would be depleted. There would be no food for plants, herbivorous animals, predatory animals and humans. Those. there are two reasons, but one result – life would disappear.