Science Journey: "The Origin of Photosynthesis: A Window into the Intricate Relationship Between Life and the World Around It"

Usha Lingappa, (PhD '21) Caltech

The origin of oxygenic photosynthesis, about 2.4 billion years ago, dramatically transformed the face of our planet and redirected the course of life's evolution. Using the different scientific perspectives offered by geology, biology, and chemistry, scientists pieced together different parts of the story concerning this crucial turning point in the history of life on Earth. For example, scientists deciphered the clues preserved in sedimentary rocks to learn about past environments and investigated the workings of modern microbes to learn about their ancient ancestors. By approaching this problem from many different perspectives (that of a geologist, biologist, chemist, and even artist) scientists were able to discover unexpected and important connections that would not have been accessible from one perspective alone.