In one-celled organisms and plants, excess water or toxic substances can be contained in _________. Specialized types of these organelles, called _________ _________, can expel these substances from the cell. In the hydra, metabolic waste products are discharged directly into the _________. Gases are also exchanged between the cells and the ___________.
In the earthworm, water , mineral salts and urea are filterd out of the body fluids into the __________, and are then excreted. There are __________ nephridia in most of the body segmnts. Each nephridium does the same job as the ___________ in a human. The sites ina grasshopper in which water, mineral salts and uric acid accumulate are called __________. These tubules remove cell wastes from the __________ and pass them into the ___________. From here they are eliminated from the body along with the __________ wastes.
2007-04-21
11:56:42
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5 answers
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asked by
Anonymous
in
Biology