1st September se class start hua...
29th September se exam...
waah Modi Ji!
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A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds.
you have to study harder your exams are coming.
best of luck for your exams
btw my exams are also going to start on 13 sep.
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Answer:
the process by which green plants turn carbon dioxide and water into food using energy from sunlight
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