There are many bacteria on the sea floor because they feed on the bodies of dead sea creatures that fall to the ocean floor. Also, the bacteria feed on the chemicals that flow from hydrothermal vents on the ocean floor.
Why are so many bacteria found at the bottom of the ocean and sea?
Because the bottom of the sea is rich in all kinds of minerals and decaying debris. Its the same reason why you find more bacteria in the soil rather than in the air.
Reply:Another reason they are plentiful and other more advanced organisms are not is that they have adapted so that they do not need ogygen to breath, but can use sulfur or nitrogen instead. Deep water is depleted in oxygen.
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