What do you call a word that emphasizes the importance of the antecedent?

Why does lewis thomas express concern about what we would say to beings from another planet

My dog sleeps beside my bed he wakes me up in the middle of the night to let him out. complete, run-on sentence or comma splice

Correct the sentence by selecting the proper pronoun usage. they assigned the solo parts to ellen and her themselves. she themselves her theirselves she herself correct as is