Answer:
when body temperature rises, such as when exercising on a hot day, the dermal blood vessels will dilate, in the sweat glands begin to secrete more sweat. the invaporation of the sweat from the surface of the skin cools the body by dissipating heat.
Explanation:
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Answer:
Their population tended to be larger than those of hunter-gatherer societies.
Answer:
(a)45:55
Explanation:
Normally the whole blood is consist of about 45% of blood cells in which there are white blood cells and red blood cells and about 55% plasma. The form of plasma is liquid in which the white blood cells , Red blood cells and platelets are present in suspension form plasma is mainly consist of water and salts but major part of plasma is water
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However, the brightness of a star depends on its composition and how far it is from the planet. Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs.