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Chemistery means chemical;physics means practical life;biology means about the species of worlds.

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CHEMISTRY:  The science that deals with the composition and properties of the substances and various elementary forms of matter.
PHYSICS:  The science that deals with matter,energy,motion and force.
BIOLOGY:  The science of life of living matter in all its forms and phenomena,especially with reference to origin,growth,reproduction,structure and behaviour,
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