Question

these signals are off the charts! i think we found something big! exclaimed tara. lets verify the data first, replied theo cautiously. how does the author describe the characters? appearances actions dialogue

Explanation:

The author uses the characters' spoken words (Tara's exclamation and Theo's reply) to describe them. This is dialogue, as it's the characters' direct speech. Appearances would involve physical descriptions, and actions would involve what they do, but here it's their spoken statements.

Answer:

Dialogue