Why are bacteria classified as microorganisms?

• Because they are harmful to humans

• Because they are used in food production

• Because they are very small and cannot be seen without a microscope

• Because they are visible to the naked eye

Which of the following statements about bacteria is true?

• All bacteria are harmful to humans

• Bacteria are not used in food production

• Bacteria do not exist in the human body

• Some bacteria are beneficial and used in making yogurt and cheese

What do bacteria need to survive?

• Only water

• Only food

• Only air

• Air, food, and water

Can bacteria be seen with the naked eye?

• No, they are microorganisms and require a microscope

• Yes, they are large enough to be seen

• No, they are invisible even with a microscope

• Yes, but only in certain conditions

Do bacteria respond to changes in their environment?

• Yes, but only when they are harmful

• Yes, because they are living organisms

• No, they are non-living things

• No, they remain static