there are 47000 to 50000 species of mollusks
Description: oyster with pearl
Image copyright: http://static.guim.co.uk/sys-images/Lifeandhealth/Pix/pictures/2008/11/05/oyster1.jpg
1.they have a visceral mass, a foot, and a ganglia
2.they have a mantle, soft body, and a circulatory system
3.they have ganglia, circulatory system
4. some have a shell
How they are different:
by the way they eat
10 facts about mollusks:
1.there are between 50,000-200,000 mollusks species alive in the world today
2.mollusks evolution began more than 500 million years ago
3.Palentologest use fossil shells to tell what the climate might of been millions of years ago
4.all mollusks possess a freshly mantal
5.slugs have slime for defense, movement, water retenion, reproduction nutricion
6. Many canal snails can lift ten times more there own weight.
7. Some oysters alternate there gender male one year female the next.
8.Some members of the seallops family have dozen of eyes.
9. The ocean Arctic is landica.L can live to be 220 years old.
10. boring clams can sink a ship.
a unique mollusk species
We picked the oyster as the species we are going to talk about. Oysters breath much like fish, using both gills and mantle. There is no way of telling male oysters from females by examining their shells. Oysters may change there sex one or more times in their life span. A oyster produces a pearl when foreign material becomes trapped inside the shell. Oysters are filter feeders. They feed by opening their shells and pumping water through thier gills to filter out plankton and other particles. Oysters attach to one another, forming dense reefs that provide habitat for many other fish and invertebrates.
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