1) These animals are invertebrates with spiky skins. a) Mollusks b) Echinoderms c) Arthropods d) Cnidarians 2) These are vertebrates covered with fur, have mammary glands and are warm-blooded. a) Birds b) Fish c) Reptiles d) Mammals 3) These animals have backbone. a) Vertebrate b) Invertebrate 4) These vertebrates are covered with scales, have fins and gills and are cold-blooded. a) Birds b) Fish c) Reptiles d) Amphibians 5) Which is not an arthropod? a) Spider b) Crab c) Grasshopper d) Human

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