Diatoms
One-celled plants

Donax
Bean clam

Dynamic
Used here to mean everchanging.

Drag
A retarding force or resistance against the flow of water
created by the hriction of the water along the bottom.

Detritus
Material forming a scum on the surface of ooze and mud
enviroment; composed mainly of decaying
plant material and the bacteria breaking it down.

Diploid
Having complete pairs of chremosomes. 2N.

Donax
Bean clam.

DNA (Deoxyribonucleic acid)
Carrier of genetic information in cells.

Dysphotic zone
That area beneath the euphotic zone where light can still be
detected, but does not possess enough energy for
photosynthetic acyivity.