II. MULTIPLE CHOICE Choose the best answer. Write the letter of the correct answer on the space grow 6. It produces substances needed by the stomach to perform its function a. Brain b. liver c heart d. kidnes 7. It is responsible for man's ability to learn habits and develop skills? a. Stomach b. bones C brain d. heart 8. Which set of bones that protect the lungs and heart? a. Rib cage b. skull c. pelvic bone d. backbone 9. Overpopulation affects the balance of nature. Which of the following does not support this statement. a. It may result to death of some organism b. Consumers upset the balance of nature It may result to fighting and struggle for survival d. People will work and the balance of nature will be improved 10. Which of the following can help conserve our ecosystem a. Construct buildings near the river b. Improve the ecosystem by inviting tourist to visit our place c. Protect the forests and bodies of water against harmful activities d. Encourage political leaders to build from to market roads to reach all beautiful places​