The B-lymphocyte A. Is thymus derived.
B. Matures in the thymus gland in all birds and mammals.
C. When activated will divide and for specialized plasma cells which produce antibodies.

D. Engages in a spectrum of immune functions characterized as cell-
mediated immunity.

so whats the answer

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.