B cells engulfs bacteria or toxin and then digests it. Then , it represents the antigen on its surface. The b proliferates into memory cells and plasma cells(they act of the foreign substance). Eventually a helper t cell comes on it's way and triggers more cells.
By producing progeny cells that include plasma cells and memory cells
Answer:
The species is not prey to what is already living there and as a result may reproduce uncontrollably and end up causing the other species to go extinct by stealing the resources they need.
Explanation:
This is a difficult question because the paragraph says that the scientists found the crater was dated back to the time the dinosaurs became extinct according to the fossil record, so that would make it true, but what it does not say is where they got the fossil record from or how the fossil record is correct, so that would make it false. So I would put it in as false.
