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The marine biome covers more 

than 70% of the Earth's surface. 

There are a great variety of plant 

and animal life living in the oceans.

Shorelines are where oceans and seas 

meet land. The change is abrupt and 

sudden. The plants and animals that call 

this transition zone home have interesting 

adaptations. 

Covering three quarters of the Earth's 

surface, oceans are as diverse as they 

are large. The open seas is an 

interesting and little understood world 

full of bizarre and fascinating creatures. 

This ecosystem is a self-containing 

world with a complex food chain and 

many organisms that have adapted to 

extreme and unusual conditions.

The ocean can be divided into many zones. 

The neritic zone is that part of the pelagic zone 

that extends from the high tide line to an ocean 

bottom less than 600 feet deep. 

Water deeper than 600 feet is called the oceanic 

zone.

In the sunlit zone, enough light penetrates to 

support photosynthesis. Below that lies the 

twilight zone, where very small amounts of light 

penetrate. Ninety percent of the space in the 

ocean lies in the midnight zone, which is entirely 

devoid of light.

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