You are exposed to the same pathogen twice in your lifetime. Which of the following is true?

A.) Your body will fight the second exposure much slower because it has already
used up all its antibodies against that antigen.

B.) The reaction times will be almost equal.

C.) You cannot be exposed to the same pathogen twice in your life because you
already destroyed those pathogens with your Killer T cells.

D.) Your body will fight the second exposure much quicker because it has stored
memory cells against that specific antigen.

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer? a. the chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced. b. the chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production c. free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone. d. chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone select the best answer from the choices provided

What amino acid is coded for by this sequence after the mutation

What is the compliment dna strand to the following sequence: ttgactaggcta