Competition in the Natural World

Parasites always harm their hosts.

Endoparasites feed on the outside of the host.

Parasites are often thought of as predators.

Parasites only do a small amount of damage to the host.

Parasites always reduce the numbers in a population.

Symbiosis is a close relationship between two organisms of the same species.

In mutualism, both organisms in a symbiotic relationship benefit.

Symbiosis always increases the numbers of both species involved.

Parasites are always dependent on only one particular host.

Ectoparasites feed in a living host.