The energy transfer between systems and surroundings is the difference in energy between the bond energies of the reactants and the products

amber has allowed scientists to study dna that has been preserved over millions of years.

answer: i don't know

explanation:

you need to provide a picture, otherwise i can't tell you.

if you can provide one, i'd be more than happy to you with this!

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.