High altitude training and mountain climbing would be examples where the body encounters as a result of lower than normal partial pressures of oxygen. Conditions where circulation is compromised resulting in poor blood flow, as is seen with heart disease, would be an example of . Caused by a reduced number of red blood cells, is characterized by insufficient oxygen in the blood. Oftentimes, poisons might interfere with the body's ability to utilize or transport oxygen, thus causing . Regardless of the type of hypoxia, , or bluing of the skin, is a primary sign of oxygen-deficient tissues.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

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the answer is c cumulus. cumulus clouds can be seen on a gray and rainy day, because cumulus clouds create thunderstorms. give me brainliest if right.

age range would be the answer