EVERYDAY SCIENCE

Detailed explanation-1: -Ninety percent of marine life lives in the photic zone, which is approximately two hundred meters deep. This includes phytoplankton (plants), including dinoflagellates, diatoms, cyanobacteria, coccolithophores, and cryptomonads. It also includes zooplankton, the consumers in the photic zone.

Detailed explanation-2: -About 90% of the ocean is in this layer. The whale shark, like most marine organisms, is typically found in the sunlight layer or photic zone of the open ocean layers. types of squid, are adapted to life in near darkness, cold water, and high pressure.

Detailed explanation-3: -Organisms that photosynthesize depend on sunlight for food and so are restricted to the photic zone. Since tiny photosynthetic organisms, known as phytoplankton, supply nearly all of the energy and nutrients to the rest of the marine food web, most other marine organisms live in or at least visit the photic zone.

Detailed explanation-4: -Planktonic aquatic organisms such as phytoplankton, are shallow water creatures; they are restricted to the photic zone in oceans because growth is totally dependent upon photosynthesis.

Detailed explanation-5: -There is enough sunlight for photosynthesis only in the photic zone. Some organisms live on the seafloor, rather than in the water column.