O blood has no<span> antigens and is referred to as </span>universal donor blood<span>, so that </span>will<span> not cause a reaction. So, a </span>person<span> with </span>AB blood has<span> all of the antigens that are possible, and an O negative </span>person has no<span> antigens that would cause a reaction.</span>
The answer is number 3 because the species has to adjust rapidly to change their environment.
Sometimes, DNA damages because of the chemicals , radiations and mutagens.Nucleotide excision repair is a DNA repair mechanism. There are three possible pathways to repair the DNA damage.
1) Nuclear excision repair
2)Base excision repair
3)DNA mismatch repair
the above given characteristics of the DNA makes nucleotide excision repair mechanism possible.
Answer:
Electrons are negatively charged atoms found around an atom.
