How many different kinds of monomers are there in nucleic acids?

1) this is the structure in the cell nucleus that houses a cell's genetic information

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

What will most likely happen when two bromine atoms bond together?