Parasitism .
Parasites are animals that live only at the expense of others; since they cannot thrive on their own, they use other animals as a host. Parasites are animals that live only at the expense of others; since they cannot thrive on their own, they use other animals as a host.
They are called parasites... they live off of their host
marine organisms
fungus
Parasite
Organisms that live in or on another organism (host) and benefit from the relationship at the expense of the host. Parasites can cause harm or disease to the host while gaining nutrients or protection for themselves. Examples include tapeworms, fleas, and ticks.
Organisms that live in the presence of air are called "aerobic organisms." These organisms require oxygen for their metabolic processes, such as respiration, to produce energy. Examples include many animals, plants, and certain types of bacteria. In contrast, anaerobic organisms thrive in environments without oxygen.
Usually the blue area on a map represents water. The types of animals that live there are called aquatic organisms
Land animals are also called terrestrial animals, as opposed to sea organisms that are called marine organisms. Some animals are classified as terrestrial because they are predominantly on land, although they also live or hunt in the sea (e.g. penguins).
They live in the host cells of humans and animals.
most roundworms live in the small intestine of the host but some move through the host body till they get back to the small intestine sure they live in people's bodies but they also live in deep bodies of salt water and fresh water lakes plus don't forget the soil....
Parasite. They live off of the blood of their host animals.