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Natural pearls Contrary to popular belief, a natural pearls is not formed by a grain of sand. This story is an urban legend. A natural pearl forms inside a bivalve mollusk when the shell has been invaded by a parasite or damaged. The most common reason a natural pearl will develop is due to parasitic invasion. The parasite wil burrow through the periostracum layer (outer layer) of a mollusk shell and into the mother-of-pearl beneath. When the parasite penetrates the mother of pearl in comes in contact with the mollusk's mantle muscle. This muscle contains cells known as epithelial cells. These cells produce a substance called nacre which coats the inside of the shell (mother-of-pearl) and is the substance of which a pearl is composed. The parasite becomes lodged in this mantle muscle and dies. The mollusk's definsive reaction is to grow a sac around the intruder. This sac is called the pearl sac. Once the sac encases the intruder the cells begin to deposit nacre- which is composed of aragonite and calcite (a calcium carbonate compound) platelets. Cultured Pearls Cultured (marine) pearls are grown by inserting a rounded bead of mother-of-pearl and a piece of mantle tissue containing epithelial cells from a donor mollusk into the gonad, or reproductive organ, of a host mollusk. The donor tissue grows into a pearl sac around the bead. As in natural pearl production, this sac then deposits nacre.
What else can I help you with?
Are pear flavored jelly beans made with real pears?
they are made with real pear puree
Where do you get pear pads?
where pear pad be made i want it and where pear pad sell,i so really want the pear pad what year pear pad for sell
Is there a pear crumble?
yes home made
What does perry mean in french?
I once read that Perry was the name of a blended drink made with pear wine
Where do you you get a pear pad?
There is no such thing as a "pare pad" iCarly and other shows must use it for copyright reasons. There is no actual place to get one.You can get an iPad at apple.com which is what the pear pad is modeled after.
What is babycham made from?
Babycham is a brand of sparkling perry (pear-flavored cider) made from fermented pear juice. It has a crisp, fruity taste and is popular as a light and refreshing drink.
Which pear is not a pear?
A "prickly pear" is not actually a pear.
Where can you get an Ipear iPod?
you CAN'T iCarly made it up so they would not have to sponsor apple it's the same with the pear phone and pear pad
What happened when two fruit companies merged?
They Made A Perfect Pear
What happened when the two fruit companies merged?
They made a perfect pear
Does the pear pad exist?
yes the pear pad does exist not just on icarly or victories but there is a hole company of pear pads, ipear, pear phone and so on and one last thing pear laptops.
What is the answer to algebra with pizazz by creative publications page 160?
They Made The Perfect Pear.Actually its They Made A Perfect Pear not the
