Which scenario best describes an impact of aging on cognition

Assume you were going to teach this information to a group of seventh graders. pick a title for your presentation that would make the seventh graders want to listen to you.

Which of the following could use reverse transcriptase to transcribe its genome? a) ssrnab) dsrnac) ssdnad) dsdna

The tissues of the arms and leg can't survive for longer than without a continuous blood supply. 2 hours 1 hour 3 hours 4 hours