Australian embryologists have found evidence that suggests that the elephant is descended from an aquatic animal, and its trunk originally evolved as a kind of snorkel.

(a)..
(b) that has suggested the elephant descended from an aquatic animal, its trunk originally evolving
(c)suggesting that the elephant had descended from an aquatic animal with its trunk originally evolving
(d) to suggest that the elephant had descended from an aquatic animal and its trunk originally evolving
(e) to suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved

in this descended from is correct

[Deleted because this question is from a banned source - see below.]

in this descended of is correct.

when you post problems, you need to post the source of each of the problems.
thank you.

source of first one is GMATprep and that of second one is SC1000

The two forms are actually quite different. When used as a verb or a past participle, we use "descended from":

Humans are believed to have descended from apes. (verb)
Humans are animals descended from apes. (past participle)

When using the noun "descendant," we use the preposition "of."

We are all descendants of our African ancestors.

Notice than in the second problem, "descended of" is not featured in any of the answer choices.

Rey

thanx a lot Rey!

Please read (and follow!) the forum guidelines before posting.

1000SC is a banned source because it illegally uses copyrighted problems without permission. (And, even if it didn't, we'd ban it anyway - a lot of the problems in the set are fine, but there are a number of bad ones that can actually mess up your study if you use them!)