Segmented Worms take breath through:_________?

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Insulin drug was discovered by____________?

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The study of organisms and their environment is known as ________?

A. Acoustics B. Ecology C. Ichthyology D. None of these...

Which one of the following mixtures of gases is required in gas welding?

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Unit of specific gravity is?

A. Pascal B. No unit C. Mass/volume D. None...

Enzymes are organic catalysts made up of ?

A: Carbohydrates B: Proteins C: Nucleic Acid D: Fats...