A word that totally slipped my mind?

Question

It means like two organisms feeding off each other (but not parasitism). They each give and take from each other and cooperate together.

This word totally slipped my mind--I FEEL, but idk if it's true, that the prefix is either bi- or mi-

Answer 1

Symbiotic.

Answer 2

Symbiosis.  (10 pts pls)

Answer 3

is it ............

Answer 4

Symbiotic?

Mutualism?

Commensalism?

Answer 5

Symbiosis