AP BIOLOGY

Detailed explanation-1: -"Marine systems are the world’s oceans. For mapping purposes, the map shows ocean areas where the depth is greater than 50 meters. Global fishery catches from marine systems peaked in the late 1980s and are now declining despite increasing fishing effort.

Detailed explanation-2: -Marine ecosystems are aquatic environments with high levels of dissolved salt. These include the open ocean, the deep-sea ocean, and coastal marine ecosystems, each of which has different physical and biological characteristics.

Detailed explanation-3: -Salt water ecosystems, also known as marine ecosystems, are aquatic ecosystems whose waters harbor a significant amount of dissolved salts. They are found in diverse geographic locations across the globe, and are home to an array of living and non-living components, from phytoplankton and jellyfish to seaweed and sand.