Symbiotic

adjective/sim-bi-ot-ik/

Meaning

involving interaction between two different organisms living in close physical association.

In context
The symbiotic relationship between bees and flowers is essential for pollination.

Remember it

SYM (together) + BIO (life): two different living things sharing life side by side.

Use it well

Great in science writing; pairs with 'relationship' — extend it as a metaphor for teams that need each other.