i think it is the 2nd one
The answer to this question is that two different neutral isotopes of
the same element will have the same atomic number. This is due to them
having the same number of protons, and it is these protons which
determine the atomic number. However, these istotopes will have
different masses due to a difference in the amount of neutrons.
Tree sap getting hardened
100,000,000 years ago there were mosquitoes like today and also like today they fed on the blood on animals. Namely dinosaurs
Sometimes after biting a dinosaur they’d land on a branch of a tree and get stuck in its sap
The opposite strand would read TAACTG because the two pairs are A-T and C-G of the nucleic bases.
