A animal has to have oxygen to live, some animals have evolved to not having oxygen,https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjxv4f49ePL...a web site telling about the animals that have evolved.
Answer:
Cytoplasm is defined as the the material within a living cell. It is composed mainly of water but also contains enzymes, salts, organelles, and various organic molecules.
Yes it is.
Carbon dioxide goes through plants, which they turn into oxygen. Humans and animals take in the oxygen and breathe out carbon dioxide. Then it repeats.
