Marine biodiversity refers to the variety and abundance of life forms in the world's oceans and seas. This field of research focuses on studying and understanding the different species of plants, animals, and microorganisms that inhabit marine environments, as well as the interactions and relationships between them. Researchers in this area often investigate the factors that influence marine biodiversity, such as climate change, pollution, overfishing, and habitat destruction. Understanding and conserving marine biodiversity is crucial for maintaining the health and ecological balance of marine ecosystems, as well as ensuring the sustainability of marine resources for future generations.