parasite
It's called a parasitic relationship.
A parasite is an organism that lives in or on another organism (host) and benefits at the expense of the host's health or resources. Parasites can cause harm to their hosts by causing disease or feeding on their tissues.
A living organism
This is known as a symbiotic relationship, where one organism lives in or on another organism. The organism living within is called an endosymbiont (e.g., bacteria within the human gut), while the organism living on the surface is an ectosymbiont (e.g., barnacles on a whale).
A living thing that produces another living thing like itself is called a parent.
Any living being is called an organism. Organisms are individuals that display the characteristics of life, such as growth, reproduction, and response to stimuli.
parasite
An organism that eats another organism is called a consumer.
An organism that is no longer living is called dead or deceased.
An organism is another word for a living thing.
A host...
An organism that kills and eats all or part of another organism is called a carnivore.