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Waveform Audio File Format  |  1995-06-29  |  368.8 KB  |  1 channel  |  22,050 sample rate  |  33 seconds  |  [TEXT/LMAN]
Transcription: Soft-bodied invertebrates, animals without a backbone, include the sponges, jellyfish, slugs, and all the different kinds of worms. They have a soft body that is not protected by a hard outer skeleton. The most primitive of the soft-bodied invertebrates are the sponges. They are made up of cells supported by a simple internal skeleton. Some soft-bodied invertebrates are protected by a shell. For example, snails, clams, and oysters each have one or two shells to protect them from predators and from drying out when they are out of water.