To destroy animals and plants when they die, preventing them from fossilizing.

Decomposers

Explanation:

Decomposers are defined as those organisms that decomposes the organic components of the dead organisms. For example, microbes and saprophytes.

When plants and animals dies, the decomposers eats up the organic substance. These consumption of organic substances helps in the growth and expansion of the microbes.

The decomposers does not allow the organisms to undergo fossilization process. It prevents them from turning into a fossil. The organism completely decays if there is no hard parts present in it.