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• How to grow bacteria?
• How to grow bacteria colonies?
• How to count bacteria?
• Study the effect of pH on household bacteria.
• Study the effect of temperature on bacteria growth
• Study the effect of antibiotics on bacteria count
• Study the effect of light on bacteria growth
• Study the effect of UV (Ultra Violet light) on bacteria growth
• Study Bacteria classification. 
• How can we control the growth of anaerobic bacteria?
• How can we control the growth of aerobic bacteria?
• Study the effect of different nutrients on bacteria growth.
• How fast do the bacteria grow? (reproduction or fission rate)