Are there any other processes that kind of do what photosynthesis does?

yes it can change the leaf color or it could take in light aka plant sunbathing.

Explanation: i just know about plants

Yes there is. It's called chemosynthesis

Explanation:

In some deep ocean places, groups of living species (excluding bacteria) have been discovered that rely exclusively on chemosynthetic bacteria, with a full food chain beginning with these chemosynthetic bacteria as primary producers.

And photosynthesis is evidently not possible at the depths where these organisms have been discovered (4 km and deeper)

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation: