Please help me answer these questions (in 3-5 sentences):
1. What is Protozoa? How does it differ from bacteria?
2. Where do they usually live? How do they survive?
3. What are the different harmful effects of protozoans and bacteria to the human body?
4. What measures can you suggest to ensure a safe drinking water free from protozoans and bacteria?
5. Why is there need for clean drinking water?
Thank you! :3