The difference between visible light and gamma rays is that a. the amplitude of visible light is greater. c. they travel through a different medium. b. the speed of gamma rays is greater. d. the frequency of gamma rays is greater. select the best answer from the choices provided a b c d

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.