When you exercise in a thermally neutral environment or in a hot environment, the metabolic heat load places a considerable burden on the mechanisms that control body temperature. Let's look at some of the physiological changes that occur in response to exercise while the body is exposed to heat stress. For the purpose of this exercise, let's compare the responses of a dehydrated athlete to a well-hydrated athlete. Let's assume that the athlete is exercising at a steady, submaximal intensity in a warm environment. ldentify which physiological responses to heat stress increase, decrease, or stay the same.
1. End-diastolic volume
2. Demand for blood flow and oxygen to muscles
3. Working muscle blood flow
4. Body temperature
5. Cardiac output

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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there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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