Biosphere is occupied by living organisms
Desert because cacti store water and sidewinder snakes bury themselves in sand and many animals are nocturnal hope this helps god bless
I would think this is true.
This may be caused by cellular respiration, precisely, the glycolysis stage of anaerobic respiration (because an athletes in a race would need immediate energy). Glucose breaks down at this stage to produce lactic acid, so it would probably make sense that the concentration of sugar decreases.
This is only what I think, and may not all be truth, so I suggest that you wait for a more 'advanced' response :D