Which branch of biology studies life in seas and oceans?

The branch of biology dedicated to the study of life in seas and oceans is Marine Biology. This specialized field investigates the diverse organisms that inhabit saltwater environments, ranging from microscopic plankton and algae to fish, marine mammals, and invertebrates. Marine biologists study their behaviors, interactions, adaptations to marine conditions, and the complex ecosystems they form, as well as the physical and chemical properties of these aquatic habitats. It's a crucial field for understanding ocean health and biodiversity.

• Zoology is the broader study of animals, but it is not exclusively focused on marine life.
• Microbiology is the study of microscopic organisms, which can be found in marine environments, but the field itself is not limited to the ocean.
• Ecology is the study of how organisms interact with each other and their environment, a broader discipline that includes marine ecosystems but is not solely focused on marine life.