Marine biologists study ocean ecosystems, focusing on the life forms that inhabit them, such as fish, mammals, and coral reefs. They explore how these organisms interact with each other and their environment, contributing to our understanding of biodiversity and ecological balance. Their work often involves field research, laboratory experiments, and data analysis. Marine biologists may also work on conservation efforts to protect endangered species and habitats, ensuring the health of our oceans for future generations. They often collaborate with other scientists and organizations to address issues like pollution and climate change affecting marine life.