âI think weâve read every single book they have.â Mark chuckled. He still wasnât ready to put the children downâWill was hanging off of one hip, his hand on Markâs shoulder as he stoically looked down at Bridget, and Mabel had nuzzled into the crook of Markâs neck with a contented sigh.
Diatoms are producers within the food chain. A unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule. These frustules show a wide diversity in form, but are usually almost bilaterally symmetrical, hence the group name.
Diatoms: 5600 spp...It is estimated that there are between 5,000 and 10,000 species of diatoms. They are found throughout the world in the soil and in both fresh and salt water. The cell walls of diatoms show an intricate beauty that is unsurpassed.They have occurred in enormous numbers leaving vast deposits of cell walls which are used today as a part of several hundred industrial products (e.g., chalk, talc, abrasives, filters).iatoms: 5600 spp...It is estimated that there are between 5,000 and 10,000 species of diatoms. They are found throughout the world in the soil and in both fresh and salt water. The cell walls of diatoms show an intricate beauty that is unsurpassed.