Chaetognaths are between 3mm and 10cm (0.125–4 in) long, and have bristly jaws for seizing their prey (plankton). Although invertebrates, they swim like fish, by means of fins. They are hermaphrodite. Some species are useful indicator organisms because they are sensitive to the temperature, salinity, and depth of the water in which they live.
Related category• ZOOLOGY
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