Question : When did water first appear on the Earth’s surface?
Answer: It took about eight hundred million years for the Earth’s surface to cool and water bodies to form.
Question : What is the name of the first unicellular organism found in water?
Answer: “Protozoa” is their name.
Question : How can we see protozoa?
Answer: We need a microscope to see them.
Question : What makes Earth different among all the planets in our solar system?
Answer: Earth is the only planet in our solar system that has life.
