Changes

An '''invertebrate''' (in contrast to a [[vertebrate]]), is an [[animal]] with no [[spine]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>

An '''invertebrate''' (in contrast to a [[vertebrate]]), is an [[animal]] with no [[spine]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>

Most living things are invertebrates, including [[arthropod]]s, [[mollusc]]s, and [[bacteria]].

Most living animals are invertebrates, including [[arthropod]]s, [[mollusc]]s, and [[annelids]].

 

[[Shark]]s and [[sting ray|rays]] are a special class under this description, since they do not have bony [[skeleton]]s, and hence no spine.  They do, however, have a similar structure to vertebrates.  They are called [[notochord]]s.

The phyla contained in Invertebrata are:

The phyla contained in Invertebrata are: