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by toraella
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1. Centric diatoms have radial symmetry2. Pennate diatoms have bilateral symmetry

There are over 100,000 different species of diatoms. The shape of each diatom is species specific however each species has one of two different structures.

LocationDiatoms live where ever there is light and water. This ranges anywhere from the ocean, to a pond, to moist soil, and so on.

ReproductionAlong with the silica based shell (frustule) surrounding diatoms, their method of reproduction is what separates them from other protists. After the parent cell divides into two identical halves the daughter cells are left unable to grow due to their strong frustule. As this process continues the species gradually decrease in size. In order to restore the original size the daughter cell must find an auxospore which is a special cell with which the daughter cell reproduces asexually. A new frustule is then created and the daughter cell may continue to grow.

EnergyDiatoms are similar to plant cells due to the fact that they use photosynthesis in order to make energy.

Movement and AdaptationsMany diatoms do not move and in fact remain stationary all of their lives however some pennate diatoms are able to slide among certain surfaces due to fibrils that stick to surfaces when they contract. Although most diatoms will stay stationary most of their lives they have found ways to adapt to their environments to make the most suitable lives for themselves. Some species of diatoms float around in the water that they live in. They will attach to each other in order to prevent themselves from sinking. Others form a stalk which is used to stick to certain surfaces. Other diatoms will grow specifically to form around certain materials to allow themselves to latch on.

Bibliography"Diatoms: Definition, Characteristics & Types." Education Portal. N.p., n.d. Web. 11 Nov. 2013. . Mann, David. "Diatoms." Diatoms. N.p., n.d. Web. 11 Nov. 2013. . "What are Diatoms?." :: Diatoms of the United States. N.p., n.d. Web. 11 Nov. 2013. .

Effects on Humans-diatoms produce 40% of Earth's oxygen-the species specific structures are from different locations and are used to help police determine locations of crimes-silica walls do not decompose and are used to view previous conditions of a specific habitat

Life CycleBoom (Spring/Summer): reproduce quickly, float aroundBust (Autumn/Winter): more die, sink to bottom



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