1 Its cost, on average, is $650, compared to $400 for take-home trays and under $100 for over-the-counter bleaching trays or whitening strips. 2  Results can be unpredictable, depending on factors such as age, heredity and the type of staining that is present.
Plankton (singular plankter) are a diverse group of organisms that live in the water column of large bodies of water and that cannot swim against a current. They provide a crucial source of food to many large aquatic organisms, such as fish and whales.
Marine Biology. Plankton. General Info: Plankton comes from the Greek word âplanktosâ which means drifter. Movement Most organisms move with the current. Some have the ability to move on their own. For example, copepods are the fastest animal for their size-they move more than 500 body lengths per second.