I am not sure if you mean carbon dioxide instead of oxygen, since plants take in carbon dioxide from the air and, together with water, convert it into oxygen and sugar. The process is called photosynthesis. There is however also a reaction whereoxygen is used from the air in order to make sugar.
Answer:
One way that Julio can explain such differences is that their environments are very similar and therefore the traits that were best suited for their survival were passed on from generation to generation. The traits that each species developed differently would have been due to their diet. Each species has a different diet and certain traits allow them to more easily hunt/gather the food that they need to survive. For example, grizzly bears and sea otters both eat fish as their main diet and therefore have both developed canine teeth, while rabbit teeth are different due to them only eating vegetation.
Explanation:
<span>The vesicoureteric junction</span>
It was at that POINT MUTATION began