a close, long-term relationship between two or more species
an organism that consumes another.
an organism that is eaten by another.
a relationship where both organisms benefit from each other.
a relationship where one organism benefits and the other is not helped or hurt.
a symbiotic relationship where one organism benefits and the other is harmed.
an organism that feeds off of another living creature, usually without killing it
the organism that is harmed in a parasitic relationship
when two or more organisms fight for the same limited resource (food or space.)
A bird builds its nest in a tree where it is safe from predators. The tree is unaffected by the birds.
A tapeworm lives inside the digestive tract of a dog. The dog begins to lose weight over time because the tapeworm is taking away its nutrients.
Stinging ants live in a tree with thorns for protection. In turn, the ants protect the tree from being eaten by other animals.