Which diagram best represents the percentage of this radioactive isotope sample that will remain
after 2 half-lives?
select one:
a. diagram 3
b. diagram 4
c. diagram 2
d. diagram 1

Which of the following are not matched correctly? cd8+: directly destroy infected or cancerous cells t reg cell: reduce the adaptive response once threat passes t l: activate cellular branch (cytotoxic t cells, macrophages, nk cells) t 2: stimulate b cells to make antibodies t (cd4+): mhc i