What is a retrovirus?

A retrovirus is a virus composed of RNA. It has reverse transcriptase, which allows them to transcribe their RNA into DNA after they gain entrance in a cell. That DNA will then integrate itself into the chromosomal DNA of the host cell.
One well-known example of a retrovirus is HIV.
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Competition. interaction among organisms that compete for the same natural resource (food, shelter, water, space) in an ecosystem. predation. an interaction in which one organism kills another for food. predator. prey. symbiosis. mutualisum. commensalisum. parasitisum.

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To kill bacteria from our body especially from stomach