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This book provides an introduction to the environmental and anthropogenic threats facing the world’s oceans and outlines overview of the problems and benefits of living in seawater, with an ecological survey of marine organisms. Marine biology is the scientific study of organisms that live in the oceans and other saltwater environments such as estuaries and wetlands. The ocean is a complex three-dimensional world covering approximately 71% of the Earth’s surface. The habitats studied in marine biology include everything from the tiny layers of surface water in which organisms and abiotic items may be trapped in surface tension between the ocean and atmosphere, to the depths of the oceanic trenches.
