Which of your cells have all of your DNA code?

As a small change in a person's dna can cause a genetic disorder

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels