Continental Drift Theory!!
Hope this helps...have a good day!!;)
the pathway coming to the lungs are veins and the ones going away from the lungs are the arteries :)
Not for long. We use oxygen for cellular respiration and plants make oxygen so if all the plants died, we would only have so long to live
Sugar is produced by photosynthesis.
During the exercise period (10-15min) the blood lactic acid concentration increases to about 13.2 mmol/dL (same units as on graph) as the individual is having problems keeping up their aerobic respiration. After 15min, they stop exercising and the lactic acid concentration starts to return to normal as their body is able to take in enough oxygen and catches up with the excess lactic acid, metabolizing it into CO2 and H2O. The period between 15-20 min shows the fastest reduction in concentration.
