In a marine ecosystem, clownfish hide from their predators in the tentacles of sea anemones. these fish also protect anemones from butterflyfish, which eat anemones. which type of relationship do clownfish and sea anemones have?
a.
predation
b.
commensalism
c.
parasitism
d.
mutualism

D.  mutualism

Explanation:

It is a mutualism because the to species behave in ways that benefit both. The anemones  have nematocyst with a paralyzing effect in theirs prey. However clown fish  are safe because evolve in harmony with the sea anemones. In this alliance the clown fish defends the anemone too.   The anemone has urticant that  affects clownfish´s depredator.

In summary the clownfish gain feed (detritus left from the anemone)  and protection from predation. And  the clown fish protect the anemones from some of their predators.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.