Question

a third form of symsis is mutualism, in which two organisms benefit each other. for example, at cleaning stations on a coral reef, little fish called

Explanation:

To solve this, we need to identify the correct root word to complete "sym____sis". The term related to biological relationships is "symbiosis". The root "bio" relates to life (biology), so we use "bio" to form "symbiosis".

Step1: Identify the term structure

The word is "sym____sis", and we know the context is biological (mutualism, organisms).

Step2: Select the correct root

"bio" (relating to life/biology) fits to form "symbiosis" (a biological interaction). The other options "phys" (relating to physics/body) and "sphere" (a round object/area) don't fit the biological context.

Answer:

bio