Under our Atmosphere: Unbelievable Biology! Water and Light make life possible down here on our planet’s surface. From deep seas to the tops of the tallest trees’ canopies, the study of life is called biology. During this week of San Francisco summer science, we’ll strive to uncover some of the secrets of ecosystems in the city and around the world. Our bodies need proteins, carbohydrates and sugars to give us the energy to run, while plants get theirs from the sun. However, human hemoglobin and colorful chlorophyll from plants are almost the same molecule. How are living organisms the same and how are they different? Beautiful biodiversity supports the needs of all living things under our atmosphere!