Lymphocyte matures in the thymus gland; acts directly on antigens to destroy them or produce chemicals such as interferons and interleukins that are toxic to antigens:

answer; (phospholipid);

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: