What is a b cell?

a.
a lymphocyte that makes antibodies

b.
a pathogen that makes antigens

c.
an antigen that makes antibodies

d.
a virus that makes bacteria

Ascientist observes certain changes in the physical features of a particular species over time. she concludes that the species has undergone evolutionary change. she wants to study the animals by analyzing their population. she’ll use . the population of this species is decreasing considerably. if this trend doesn’t change, this species will fall under the category of animals. this is a plato question,i need to make up his biology credit.