Hello again dear readers and sorry for being out of working.This post is about the invertebrate animals (they are living things, but they have not got an internal skeleton). They can be aquatic or terrestrial and they are classified into six groups. They can be sponges, cnidarians, worms, molluscs, echinoderms, and arthropods. Here you are some pics about the main facts of each group.
Regards, Christopher.
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