Which marine pairings typically exhibits mutualism? barnacles/mussels clownfish/anemone shark/sea lion tapeworm/manatee

I believe the answer is: clownfish/anemone

Clownfish is very territorial in nature. So, when they hide within the anemone, the clownfish would prevent smaller fishes from eating the anemone. In return, the anemone would prevent the bigger fish from reaching the clownfish when they hide in it.

An autotrophic protist - they can perform photosynthesis and mainly consist of unicellular algae. they can be divided into number of systematic group according to the shape of their cell and the type of photosynthetic pigments they use.