What about the planet?

"Our" planet Earth has been there a long time ago before the living creatures of the Nature appear on it.
Is necessary to preserve and protect our house, the planet and all the known Nature processes and creatures. If we fail there are a lot of possibilities to affect the Nature in a way that we really don't understand and could suppose a lot of problems including the extinguishing of some of the Nature processes or creatures.
Read this file for more information.

What about animals?

Animals are multicellular, eukaryotic organism. All animals creatures are motile and their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their lives. They are heterotrophic organism so cannot fix carbon and uses organic carbon for obtain energy and growth.

Sources: 

Animal - Wikipedia, the free encyclopedia
Carbon fixation - Wikipedia, the free encyclopedia

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