Its a molecular substance
If the underlined verb is <em>will have been talking, </em>in the sentence Lillian will have been talking for two hours by the time she finishes her classical music lecture, then the correct answer is D. future perfect progressive.
A would be - will talk.
B would be - will have talked.
C would be - will be talking.
The answer to your query is- D. U.V. Light and space.
I believe the answer is an organism. I wish you luck!!
