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Oxygen accounts for __________ percent of totals human body mass?
Branch of biology which deals with the study of chemical components and chemical processes in living organisms is called___________?
A structure formed by groups of similar cells organized into loose sheetsor bundles performing similar functions is called as___?
A large regional community primarily determined by climate is called_____?
Out of 92 naturally occurring chemical elements how many are considered as bio-elements_____?