Fill in the Blanks LIVING THINGS' CLASSIFICATIONOnline version Complete the text about animals by Lauri Lala 1 cord spinal molluscs birds porifera coelenterates amphibians mammals echinoderms fish arthropods reptiles annelids vertebrates invertebrates five 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 .