Colder and more harsh winters are being experienced in a given area for years. Because of the unexplained shift in these temperaturos, oxon with thin and average length winter coats are becoming susceptible to disease and are freezing to death. The thick coated, woolly okon however have survived well and eventually the entire population of oxen became woolly What type of selection does this scenario illustrato? A. stabilizing selection
B. artificial selection
C. disruptive selection
D. directional selection

true                                                                                                       true true true true true true

answer: b

coz red blood cells marrow and circulates the body for 120 days.

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.