Discussing the importance of oxygen to all living organsisms? 10 points best

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answer to whoever helpsl...? Discuss the importance of oxygen to all living organisms, and describe how three different organisms-human, flatworm, and fern-obtain the oxygen they need.
 
For one it helps everyone breathe and makes it possible to have life on Earth. Many of the animals we have on Earth today wouldn't be alive thank's to oxygen, we are. Flatworm's live in freshwater and marine habitats. Oxygen is a component of water. A fern is a plant that definaley needs oxygen in order for photosynthesis. All plants need oxygen.
 
It's quite simple, any live cells need oxygen, it's the base element to all life on the planet.
Human obtain oxygen by breating it. The lungs absorb the oxygen then transfers it to the blood cells which pass the oxygen throughout the body, Flatworms absorm the oxygen in the water. Water is 2 parts hydrogen and 1 part Oxygen. Plants as well as animals breath all the time taking in O2 and breathing out CO2. In photosynthesis there is a dark phase where they are not taking in CO2 and combinig it with H2O to make glucose, In the light phase they are taking in CO2 and H2O
 
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