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1. What is the largest organ in the human body?

• a. Heart

• b. Liver

• c. Brain

• d. Skin

2. Which of these is a renewable energy source?

• a. Coal

• b. Oil

• c. Solar

• d. Natural Gas

3. What is the chemical symbol for water?

• a. H2O

• b. O2

• c. CO2

• d. NaCl

4. Describe the process of photosynthesis in plants.

5. What is the importance of the water cycle?

6. The Earth is the fourth planet from the sun.

• True

• False

7. The human body has 206 bones.

• True

• False

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