Question

form a compound sentence.
sloths spend most of their time in

the treetops of tropical jungles

trees, but they also swim sometimes

the trees of not only south america but also central america

trees but swim as well

Explanation:

To form a compound sentence, we need two independent clauses joined by a conjunction. The option "trees, but they also swim sometimes" has two independent clauses ("Sloths spend most of their time in trees" and "they also swim sometimes") connected by "but", making it a compound sentence. Other options are either phrases or complex constructions without two independent clauses.

Answer:

trees, but they also swim sometimes