Question

Please answer this correctly

Answer 1

It's the first one

Step-by-step explanation:

Compound sentences are made up of two independent clauses, either joined by a conjunction or a semicolon.

Pretty sure the second one would just be incorrect grammar, and then the third one is a dependent clause because of the word "after."

Hope this helps!

Answer 2

choice a

Explanation:it would make sense if you say he dinosaurs have gone extinct, but we still don know the reason for their extinction. hope this helped. have a nice day!!