Moving on to larger sizes we find protozoa including ciliates, flagellates and foraminifera, with different adaptations, with thicker and heavier shells. Other larvae have a globular cord. Aerosols therefore abound when the sea is rough. Many animals feed on organic particles consisting of detritus, bacteria and small planktonic organisms suspensors. The oceans are on average a few kilometres deep, so deep currents are formed which take into account the stratigraphy of the seabed.
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