The plants might die out because there is no one to pollinate them
While photosynthesis requires carbon dioxide and releases oxygen, cellular respirationrequires oxygen and releases carbon dioxide. It is the released oxygen that is used by us and most other organisms for cellular respiration. We breathe in that oxygen, which is carried through our blood to all our cells.
Organ
The heart is a muscular organ that is part of the circulatory system.
The blue whale! It’s actually not only the biggest animal in water but also the biggest animal in the world! :)