EVERYDAY SCIENCE

Detailed explanation-1: -Answer and Explanation: The majority of marine organisms are found in coastal areas, as opposed to open ocean or deep water habitats. Coastal areas receive more sunlight and are usually warmer than open ocean or deep water habitats.

Detailed explanation-2: -Some organisms in this environment, specifically those in the intertidal zone, are starfish, sea anemones, sponges, marine worms, clams, mussels, predatory crustaceans, barnacles and small fish. Hydrozoa, or hydroids, also live in shallow marine ecosystems and eat surrounding algae and zooplankton.

Detailed explanation-3: -Although they make up only 10 per cent of the ocean, these shallow waters of coastal seas (within 230 km of land) are home to 90 per cent of all marine species.

Detailed explanation-4: -Dissolved oxygen in seawater comes from mixing (where the surface meets the atmosphere) and as a byproduct of photosynthesis. As a result, the most oxygen-rich water is found near the surface, so this is where the majority of marine organisms live.

Detailed explanation-5: -So, based on global fisheries and the overall biodiversity of coral reef ecosystems, the Pacific Ocean wins for most marine life.