1 In-office bleaching is more expensive than take-home alternatives. 2  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.
Sheldon James Plankton, or simply Plankton, is a character in the Nickelodeon animated television series SpongeBob SquarePants.Although usually an antagonist, he is frequently shown as a protagonist or an antihero. He is voiced by Mr. Lawrence and first appeared in the episode  Plankton!  on July 31, 1999.heldon James Plankton, or simply Plankton, is a character in the Nickelodeon animated television series SpongeBob SquarePants.
That is the basis for the name of this Phylum. There are various taxonomic keys that can be used to identify freshwater rotifers, of which there are more than a thousand species. A good key for species commonly found in lake plankton is Stemberger, R.S. 1979.A Guide to Rotifers of the Laurentian Great Lakes.otifers (Phylum Rotifera). These are small zooplankton, typically 100 to 500 um (microns) in length, with two distinctive features. First, they have a ciliated region at the apical or head end called a corona.