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What are 4 characteristics that are present at some stage of development? notochords, postanal tails, nerve cord,& gillslits
what is the notochord? firm flexible structure
What does the notochord replace in many animals? backbone
what is the postanal tail? muscular structure
what animals do not lose the notochords? tunicates, lancelates
what is the nerve cord? tube like structure
What does the nerve cord change into in most fish? spinal cord & brain
What are gillslits? pairs of openings
what do they change into on fish? gills
what is an endoskeleton? internal skeleton
what is the endoskeleton made of? bone or cartilage
what is the function of the endo skeleton? attach to skeleton,support,& protect
what are vertebrae? bone that make up the backbone
Created by: peanut112297