Which of these molecules' monomers is a series of nucleotides? * DNA

RNA

Both

Neither

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

9. what area of study applies scientific findings to create ways for solving problems or improving life? a biogeology b mathematics c manufacturing d engineering

What are the three different shapes or structures shapes or structure of carbon-based molecules?