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Dead Man's Finger (Codium Fragile) a common intertidal species.

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The intertidal zone ranges from the highest high tide to the lowest low tide, approximately 200 meters out. This is also part of the neritic zone above the continental shelf. It is subdivided into 4 zones: spray zone, high intertidal zones, middle intertidal zone, and low intertidal zone.

Residents of this zone include marine species as well as avian species. Many of these species adapt to withstand wave energy by attaching themselves in place and being extraordinarily flexible or sturdy. The threat of desiccation threatens many of these intertidal species as well, leading them to close moisture within themselves or to retreat to the depths of this zone.

Common Species:
Sea Stars
Snails
Sea Gulls
Crabs
Algae

https://education.nationalgeographic.org/resource/intertidal-zone
https://oceanservice.noaa.gov/facts/intertidal-zone.html#:~:text=The%20intertidal%20zone%20is%20the,extend%20for%20hundreds%20of%20meters.

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The ocean shelf is a section of the continent covered by a shallow layer of water. It extends from the shore to a shelf break where the ocean floor slopes down dramatically. The Atlantic Shelf ranges from 1/2 a mile near Florida to 260 miles off the coast of Maine. It was formed by sediments flowing from rivers which eventually settled along with glaciers gouging out areas of the land/ocean.

https://pubs.usgs.gov/pp/0529a/report.pdf

https://education.nationalgeographic.org/resource/continental-shelf#:~:text=Over%20many%20millions%20of%20years,at%20the%20edges%20of%20continents.

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The Continental Shelf receives sunlight from the top and therefore is able to support large amounts of marine flora and fauna. As species venture farther from shore, they are often larger than intertidal species as they have more space and more predators.
https://www.amnh.org/explore/ology/ology-cards/180-continental-shelf

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The Bathyal zone, also referred to as the 'midnight zone,' is the portion of the ocean from the depths of 3,300ft-13,100ft. With these depths, almost no sunlight reaches this region (hence its nickname), meaning photosynthesis cannot support common species that make up the base of many ecosystems' food chains (i.e. phytoplankton and aquatic plants). Extreme pressures make these conditions even less hospitable with over 5850lbs of pressure for each square inch.

Many species adapt to the Bathyal zone with the abilities of bioluminescence.

Common species:
-Dragon fish (one of main Bathyal predators)
-Whale fishes
-Sperm whales dive to as deep as the Bathyal zone

https://www.weather.gov/jetstream/layers_ocean

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The Abyssal zone is the second deepest layer of the pelagic zone. The abyssal zone is approximately from 4000m deep to the ocean floor, under 200-600 atmospheres of pressure, and about 4 degrees Celsius (39 degrees Fahrenheit). No sunlight reaches this layer of the ocean, therefore the primary producers are solely dependent on chemosynthesis to obtain nutrients. Common species found are Anglerfish, Colossal Squid, Giant Tube Worms, Sea Spiders, White Crabs, and many bioluminescent organisms.

There are hydrothermal vents formed along mid-ocean ridges found on the abyssal sea floor that can reach 750 degrees Fahrenheit. Minerals such as iron sulfide, barium, calcium, and silicon can be found here in the form of black or white smokers.

The abyssal zone makes up 83% of the oceans and about 60% of earth's surface, 300,000,000 square km in total.

https://oceanservice.noaa.gov/facts/vents.html
https://www.britannica.com/science/abyssal-zone
https://www.whoi.edu/know-your-ocean/ocean-topics/how-the-ocean-works/ocean-zones/abyssal-zone/

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The Hadal zone is the deepest part of the ocean. It is generally composed of extremely deep oceanic trenches like the Marianas trench. Hadal habitats comprise 0.25% of the seafloor. The water temperature of the hadal zone remains just over freezing (32 degrees F). It is a very difficult zone for organisms to live in because all of the extreme conditions of the other zones are at their absolute extremes.

The name 'hadal' comes from 'Hades,' the God of the Underworld in Greek mythology.

There are 33 hadal trenches in the ocean, 26 of these trenches are located in the Pacific Ocean, 3 in the Atlantic, 2 in the Indian, and 2 in the Southern.

Some species that live in the hadal zone are
Snailfish: The deepest living family of fish species. They are the most dominant fish species in the hadal zone.
Amphipods: Generally very small soft-shelled crustaceans that likely hold an important role in the hadal food chain.
Sea Spiders: Sea spiders are benthic epifaunal arthropods that are found in every zone of the ocean including the hadal zone.

https://www.whoi.edu/know-your-ocean/ocean-topics/how-the-ocean-works/ocean-zones/hadal-zone/

https://web.whoi.edu/hades/all-about-trenches/