Symbiosis is the interaction between species in an ecosystem.
- Mutualism is a symbiotic relationship when both species benefit.
An example is a moth obtaining nectar from a flower and carrying pollen for the plant.
- Parasitism occurs when one species benefits and the other (host) is
Leeches are parasites that drain blood from their hosts.
- Commensalism occurs when one species benefits and the other is unaffected.
A healthy ecosystem is a complex web
with countless symbiotic relationships.