Biology
Blood is carried towards the heart by __________?
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The branch of biology which deals with the study of social behavior and communal life of human beings living in any environment is called ?
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__________ is essential for the formation of hemoglobin.
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Out of 92 naturally occurring chemical elements how many are considered as bio-elements?
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___________ are needed as a source of energy for the vital activities of the body?
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Oxygen accounts for ____ % of totals human body mass?
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The atoms of different elements combine with each other through ionic or covalent bonding to produce compounds this stable form is called:
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Which one of them is a micro-molecule?
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A structure formed by groups of similar cells organized into loose sheets or bundles performing similar functions is called as:
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