Fill in the Blanks LIVING THINGS' CLASSIFICATIONOnline version Complete the text about animals by Lauri Lala 1 annelids fish arthropods five porifera spinal reptiles vertebrates coelenterates echinoderms amphibians cord birds invertebrates molluscs mammals Animals can be classified into , if they have a spinal cord and , if they do not have a . There are groups of vertebrates animals : , , , and . Invertebrate animals are classified into six groups : , , , , , and .