What organisms do you know living inside other organisms?

Such organisms are called parasites.
Animals living inside other organisms are flatworms (liver fluke, bovine tapeworm, pork tapeworm), roundworms (roundworm, pinworm).



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.