The answer would be a Fused sentence because A fused sentence (or run-on) occurs when two independent clauses are joined without punctuation or without a coordinating conjunction. Which we can clearly see in the sentence
Answer: A group of activists sabotaged the Glen Canyon dam.
Explanation:
"of insects" is an adjective phrase because it's a prepositional phrase that acts as an adjective. It modifies the word "group"; In other words, "of insects" is used to describe the word "group".
