Answer:
"The immune system is made up of special organs, cells and chemicals that fight infection (microbes). The main parts of the immune system are: white blood cells, antibodies, the complement system, the lymphatic system, the spleen, the thymus, and the bone marrow."
Explanation:
Reproductive isolation is when 2 organisms can not mate and produce viable offspring. Once 2 organisms are reproductively isolated, this is considered speciation event.
Arteries
The arteries are the blood vessels
that carry repeated loads of oxygen-rich blood from the heart to all parts of
the body. Arteries are muscular and elastic tubes that operate under high
pressure exerted by the pumping action of the heart. The largest artery is the
aorta while the arteries' smaller branches are called arterioles and
capillaries.
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Answer:
change their external environment
