The answer is: <span>Ecological Succession
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<span>The two different kinds of t-cells are the Helper t-cells and the killer t-cells.
T cells are named T cells after the thymus, an organ situated under the breastbone. They are produced in the bone marrow and later move to the thymus where they mature. Helper T cells have a primary tsak of activating the B cells and killer T cells. The killer T cells are specialized in attacking cells of the body infected by viruses and sometimes also by bacteria. Additionally, they can attack cancer cells.</span>
Answer:
the answer should be A. Fission
The right option is Intolerance
Drug Intolerance is a situation
in which drugs cause adverse effects such as drowsiness or stomach upset and
the body is unable to tolerate or bear these effects. An individual with drug
intolerance may be able to continue with the drugs if the dose is reduced
because drug intolerance sometimes disappears as drug therapy continues.
Another pair of organisms are in the same genus
