Blood carries immune system cells, known as white cells or leukocytes. Some examples of white cells are phagocytes and lymphocytes.
Phagocytes ingest and dissolve pathogens, as well as strange particles or dying cells.
Lymphocytes are divided into T cells, B cells, and natural killer cells (NK). B cells produce antibodies to respond to foreign cells, T cells attack pathogens using enzymes and other non-antibodies responses, while NK cells combat tumors and cells infected by viruses.
Answer:
B. Oxygen molecules recombine to allow cells to get larger
The prenatal development of the internal reproductive structures of the male requires the <span>secretion of androgens.</span>
Restriction enzymes<span>, also known as </span>restriction endonucleases<span>, are </span>enzymes<span> that cut a DNA molecule at a particular place. They are essential tools for recombinant DNA technology. The </span>enzyme<span> "scans" a DNA molecule, looking for a particular sequence, usually of four to six nucleotides.</span>
