The immune system is the body's defense against disease. white blood cells, or lymphocytes, are one type of immune system cell. which of the following immune system cells make markers that tag invading pathogens for later destruction?
a. t cells
b. cytotoxic t cells
c. macrophages
d. b cells

D. B cells

Explanation:

Because White blood cells that produce antibodies and aid in immunological memory.

I think?

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.