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You are provided with three species of bacteria, Escherichia coli, Staphylococcus epidermidis and Bacillus megaterium, labelled A, B and C. You are required to

identify A, B and C, given that:

1. Escherichia coli: This is a Gram negative, rod-shaped bacterium, which produces beige colonies when grown on nutrient agar.

2. Staphylococcus epidermidis: This Gram-positive coccus produces white, raised colonies on nutrient agar.

3. Bacillus megaterium: This Gram-positive rod-shaped bacterium that gives rise to beige colonies when cultured on nutrient agar.

4. What techniques could be conducted to help confirm the species of isolated bacteria?