Marine biodiversity is the variety of life in the ocean, including different species and ecosystems. Scientists study marine biodiversity to understand how it is changing over time and what factors are causing these changes. By focusing on species diversity and richness, researchers can learn more about the importance of marine life for the health of our planet. Human activities like pollution and overfishing are putting marine biodiversity at risk, making conservation efforts crucial. To better protect marine life, scientists need to improve their methods for identifying and describing species, as well as understanding their roles in the ocean. Overall, studying marine biodiversity helps us appreciate the unique and vital ecosystems that exist in our oceans.