Lynn Margulis was an influential biologist renowned for her groundbreaking theories in evolutionary biology, particularly her work on the endosymbiotic theory. This theory proposed that complex cells, known as eukaryotes, originated through a symbiotic relationship between different species of simpler cells. Margulis emphasized the importance of cooperation among microorganisms, challenging traditional views that focused solely on competition in evolution. Her work often intersected with the fields of microbiology, genetics, and environmental science. Margulis was not only a researcher but also an advocate for a more integrated view of biology, promoting the idea that life is deeply interconnected. She contributed to our understanding of the microbiome and its essential role in health and the environment. Beyond her scientific contributions, Margulis was dedicated to education and public engagement. She authored numerous books and articles, translating complex scientific ideas into accessible language. Her passion for science and advocacy for a holistic approach to biology left an enduring legacy in the scientific community. Lynn Margulis was an influential biologist renowned for her groundbreaking theories in evolutionary biology, particularly her work on the endosymbiotic theory. This theory proposed that complex cells, known as eukaryotes, originated through a symbiotic relationship between different species of simpler cells. Margulis emphasized the importance of cooperation among microorganisms, challenging traditional views that focused solely on competition in evolution. Her work often intersected with the fields of microbiology, genetics, and environmental science. Margulis was not only a researcher but also an advocate for a more integrated view of biology, promoting the idea that life is deeply interconnected. She contributed to our understanding of the microbiome and its essential role in health and the environment. Beyond her scientific contributions, Margulis was dedicated to education and public engagement. She authored numerous books and articles, translating complex scientific ideas into accessible language. Her passion for science and advocacy for a holistic approach to biology left an enduring legacy in the scientific community.