Symbiosis: Mutualism, Commensalism, and Parasitism
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Symbiosis is a close, long-term relationship between two species: mutualism when both benefit, commensalism when one benefits and the other is unaffected, parasitism when one benefits at the other's expense.
Show
A tapeworm consuming a host's nutrients is parasitism; a bird nesting harmlessly in a tree is commensalism.
Watch for
Symbiosis names any close relationship — it does not specify which outcome applies.