Antibodies to common microorganisms have been developed by infancy. <span>An </span>antibody<span> (Ab), also known as an immunoglobulin (Ig), is a large, Y-shaped protein produced mainly by plasma cells that is used by the immune system to identify and neutralize pathogens such as bacteria and viruses.</span>
Answer:
the answer for me is the third option (c)
All organisms do have a closed circulatory system
so A <span />
I think it is that the cytoplam divides
