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clams feed by filtering water which flows across their nephridia

2007-01-11 11:47:26 · 15 answers · asked by Anonymous in Science & Mathematics Biology

15 answers

True.

2007-01-11 11:52:14 · answer #1 · answered by Brendan R 4 · 0 0

False

The clams and oyster feeds by filtering food particles from the surrounding water. Opening and closing of the valves are controlled by an adductor muscle attached to each shell. Food and other particulate matter, suspended in the water, are drawn into the oyster by the motion of small, fringe-like whips called cilia located on the gills. The quantity of water pumped by a large, healthy oyster may approach four gallons per hour. Food particles retained by the gills are conducted by ciliary action to the mouth and then to the stomach of the oyster. Matter brought into the shell, but not passed through the mouth, is collected by mucus on the gills and then discharged. Large amounts of silt are rejected in this manner. This ability to separate food from silt apparently allows oysters to survive in waters of high turbidity which occurs in many estuaries. The filtering action of oysters can play an important role in removing not only suspended sediments from the water column, but can cleanse the water of various pollutants.

ne·phrid·i·a (--)
The embryonic excretory organ from which the kidney develops.

2007-01-11 11:55:35 · answer #2 · answered by jamaica 5 · 1 0

Take out nephridia and replace that word with gills.
Nephridia are the parts that remove wastes.

2007-01-11 11:51:08 · answer #3 · answered by ecolink 7 · 0 0

isn't the nephridia like a claw or something?

2007-01-11 11:51:24 · answer #4 · answered by Carlos 7 · 0 0

Everyone else has said true so I will go with False???

2007-01-11 11:51:26 · answer #5 · answered by CaSeY LyNe 3 · 1 0

true

2007-01-11 11:53:02 · answer #6 · answered by grand96prix 3 · 0 0

true

2007-01-11 11:51:42 · answer #7 · answered by jmprince01 4 · 0 0

true

2007-01-11 11:50:55 · answer #8 · answered by Anonymous · 0 0

I'll say true.

2007-01-11 11:50:24 · answer #9 · answered by Docta Jones 4 · 0 0

true?

2007-01-11 11:51:16 · answer #10 · answered by JACQUELINE T 6 · 0 0

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