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Across 2. At some point in their lives, Chordates have __________ pouches 6. Most embryos of mammals develop inside the _____, giving the female free movement 7. Amphibians, reptiles and fishes are ectothermic. Mammals and birds are __________ 9. Some _______ are able to lose their tails to distract predators and grow it back! 11. A Greenland shark is a member of the class ____________, has cartilage instead of bone and is estimated to live up to 400 years! 13. Mammals have ____ to provide insulation 14. Both _____ and mammals have a four chambered heart. O2 rich and O2 poor blood do not mix. 15. In reptiles, fertilization of an eggs happens __________ 18. The African Lungfish is able to 'cocoon' itself, surviving for months in dry periods! It has a lung and finger like appendages for movement on land. Thus, it is considered to be a ____-finned fish 19. The class Agnatha lacks ____ that have enabled other fish to assume a predatory way of life 20. This organ allows the fish to control their buoyancy by secreting or absorbing gasses, it is called the swim _______ 23. Inveretebrate Chordates include the Tunicates and the _________ 25. The three classes of mammals are placental mammals, marsupials and ________ 26. Some extinct reptiles like the tyrannosaurus rex, also know as the _________ have a bipedal stance, an evolutionary step in the development of wings in birds 28. An evolutionary advantage that Amphibians have is the presence of _______ which help to keep eyes moist on dry land 31. The ________ lays hard-shelled amniote eggs, has a "duck bill" and "sweats" milk 34. The _____ of birds are light and hollow as an adaptation for flight 35. Compared to other animals, mammals have a larger _____ for information processing 37. Like other birds, the Peregrine Falcon has excellent ______ and a well-developed brain. It is able to see prey from far away and dive at speed of up to 380km/h to catch it! 38. Eagles have notched beaks and sharp talons for catching quarry, they classified as a bird of ____ 39. Alligators are able to hold their breath for up to two hours! Their _____ are protected by a rib cage which can expand causing air to rush in 41. _______ glands produce milk to feed young so that parents do not have to find food for them 42. Birds have a ____ for eating and preening

Down 1. A amphibian known as the ____ is able to regenerate lost limbs 2. In addition to rib cage expansion, this phylum uses the contraction of the diaphragm to draw in air (two words) 3. The amniote egg did away the need for free swimming _____ 4. The body of reptiles are covered with __________ scales. It helps to protect them from drying out and acts as a defence 5. Tunicates are in the Subphylm ___________ 8. Tunicates have _____ that is lined with cilia 10. This animal has a large shell, it is slow moving and parts of its shell was once used to make guitar picks. 12. Birds, like reptiles lay amniote eggs. However, unlike reptile eggs which are soft-shelled they are ____-_______ 16. ______ use their tongue as a sense organ 17. In addition to respiration, lungs in birds form ___ ____ that aid flying (two words) 20. Animals in the class Osteichthyes are also known as ____ fishes due to their skeleton 21. A blue whales heart is about the size of a small car and can weigh over 400 pounds! Their heart, like all mammals have four ________ 22. ________ are modified reptilian scales 24. The young of the ________ are born immature, they climb into a pouch where they continue to develop and will eventually use hopping as the primary means of locomotion 27. The first jointed appendages are seen in the class ________ 29. The Spring Peepers (frog) produce an almost bird like chirping sound. This is due to the presence of a sound producing ______ 30. Amphibian hearts have a divided atrium and a ______ ventricle 32. All Chordates have a post anal ____ 33. As an adult, how many of the Chordate characteristics do the Lancelets retain? 36. The anatomical feature of forelimbs in birds are its _______ 40. The larval stage of frogs like other Amphibians are adapted to life in _____. Adults however, are adapted to living on land