YAGAS HÍ PNAGALOJANG 1: GOPA TAKAHOO
Answer: The cell responsible for the production and secretion of surfactant (the molecule that reduces the surface tension of pulmonary fluids and contributes to the elastic properties of the lungs).
Explanation:
D. fossils will help you discover how old the rock is, fossils would not be included in the question if the answer does not relate to them