<span>Two organisms "supposed to be"of the same species, and both masculine, cannot breed together, so they can't be of the same species.<span>If an organism "A" can breed with two other organisms "B" and "C", it means that "A", "B" and "C" all (appear to) belong to a single species, but not necessarily "B" and "C" must be capable of breed together, meaning that "B" and "C" belong to different species.</span></span>
It will increase because of decreased photosynthesis. Photosynthesis uses carbon dioxide to function. So, the carbon dioxide levels would go up as the oxygen levels go down.
