Question

Is this a run on sentence
We need to gather more signatures we must protect these old-growth trees from destruction.

Answer 1

yes. adding- ,because in between signatures and we would help.

Answer 2

Answer:

Yes.

Explanation:

As it stands, the sentence would require a period directly following the word signatures. The words can be linked into a compound sentence by adding another word:

   "We need to gather more signatures, as we must protect these old-growth trees from destruction."