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This cladogram represent the evolutionary relationships among major groups of animals.

This cladogram represent the evolutionary relationships among major groups of animals. What kinds of organisms most likely gave rise to the first animals? sponges Which evolved earlier, coelom or bilateral symmetry? Bilateral symmetry

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This cladogram represent the evolutionary relationships among major groups of animals.

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  1. This cladogram represent the evolutionary relationships among major groups of animals. • What kinds of organisms most likely gave rise to the first animals? • sponges • Which evolved earlier, coelom or bilateral symmetry? • Bilateral symmetry • Which pair of animals is more closely related; annelids and arthropods or echinoderms and arthropods? • Annelids and arthropods

  2. Animal kingdom has 9 phyla: Phylum Cnideria jellyfish • Phylum Porifera • sponges

  3. Phylum Nematoda • Roundworms • Phylum Platyhelminthes • Flatworms, tapeworms

  4. Phylum Echinodermata • Starfish, sand dollars • Phylum Arthropoda • Insects • Spiders

  5. Phylum Chordata • ALL vertebrates • Humans, dogs, snakes

  6. Animals in the first 8 phyla are invertebrates, which means they DO NOT have a backbone. The only phylum that contains vertebrates (animals with a backbone) is phylum Chordata.

  7. Vertebrates are divided into 5 classes (or groups): • Fish- includes jawless fish, sharks and rays • Breathe through gills • Lay eggs in water • Have fins

  8. Amphibians (term means double life)- includes frogs, toads and salamanders • Have smooth or bumpy skin • Lay eggs in water • Gills/lungs • Breathe through skin

  9. Reptiles- snakes and turtles • Dry, scaly skin • Lay terrestrial eggs

  10. Birds- owl, chicken and stork. • Have feathers • Lay terrestrial eggs

  11. Mammals- human, dolphin, bear, bat and mouse • All have fur • Feed their young milk

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