What is the science that deals with life and the contents of the seas called?

Marine biology is the science that specifically studies life in the oceans and other bodies of water. This field encompasses the study of various organisms, including fish, mammals, plants, and microorganisms, as well as their interactions with each other and their environments. Marine biologists may focus on ecosystems within the ocean, such as coral reefs and deep-sea habitats, examining how these systems function and how they are affected by external factors such as pollution and climate change.

Oceanography, while related, primarily focuses on the physical and chemical properties of oceans, including currents, waves, and the geology of the ocean floor, rather than specifically on the biology of marine organisms. Hydrology deals with the distribution, movement, and properties of water in the environment, while environmental science examines the interactions between the environment and human activities, which may encompass marine issues but does not focus exclusively on living organisms in marine settings. Hence, marine biology is the most accurate term for the study of life in the seas.