Question: Stomata are tiny pores located on the leaves of plants. These pores permit the exchange of gases between air in the environment and plant cells located inside the leaf. Which tissue performs a similar function in vertebrates?

  Options: 
 A. The cornea in the eye
 B. The alveoli in the lungs
 C. The chambers in the heart
 D. The salivary glands in the mouth
Answer: B