Answer:
they open up to get the energy from the sun.
Explanation:
Answer:
The correct option is C.
repaying an oxygen debt.
Explanation:
This is because while running, humans breath shallowly which could not provide the oxygen requirement for the respiratory system and fit in for blood need.
After running, you tend to breathe heavily because your muscle work very hard , the body use more oxygen and produced more carbondioxide, therefore the lungs and respiratory system must try to provide more oxygen to the blood. sympathetic nerves stimulate respiratory muscles
so as to increase the rate at which we breathe.
Answer:
Other organisms were another factor. What kinds of changes in other populations of organisms could be affecting the moths?
Explanation:
umm.
Mainly by nitrogen-fixing bacteria in the soil and oceans
To allow oxygen molecule into the leaf to start photosynthesis, and to allow carbon dioxide out of the leaf after photosynthesis is over.