H2o is the most common molecule in the human body. Remember the fact that 70% of the human body is made of water? H2o is the molecule for water, meaning that H2o is the most common molecule.
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I am going to have to say algae and fungus.
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It has the same origin as other connective tissues and it connects all the body systems together.
The most appropriate answer is A !!
There is more to DNA than cytochrome c. This is just one protein.
