I think it's b. there's pressure and high or low temperatures there. I mean... it would only make sense, right?
it is an example of mutualism because both of them benefit from this relationship. The sloth gets camouflage and the algae gets to eat the insects that are on the sloth.
The following diagram shows how the moon causes tides on Earth: In this diagram, you can see that the moon's gravitational force pulls on water in the oceans so that there are "bulges" in the ocean on both sides of the planet. The moon pulls water toward it, and this causes the bulge toward the moon.