Crossword Review Exam 4: Puzzle 1: Ch 24,25,32

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Across
  1. 2. Animals in this class of vertebrates undergo a metamorphosis as they develop from the larval tadpole stage to the terrestrial adult stage. They are able to breathe through their skin.
  2. 4. Animals in this phylum all have a muscular foot, a visceral mass and a mantle. Examples include clams, snails and octopus
  3. 8. This cushy material is found in the ears and nose and in between certain joints to add cushion, like the knee cap and in between the vertebral discs
  4. 11. One defining feature of all mammals is the presence of ______ glands which provide milk to newborns.
  5. 12. Specialized stinging cells in the phylum Cnidaria (jellyfish, corals) that are located in the tentacles around the mouth (plural)
  6. 14. A single layer of epithelial cells is called _______ epithelia
  7. 15. This type of muscle tissue is found in the heart and is controlled involuntarily
  8. 16. An animal that does not have a backbone
  9. 17. A process by which living organisms constantly adjust to internal and external changes to maintain a steady state in their body
  10. 20. The four types of tissues are epithelial, connective, nervous and _______
  11. 21. Earthworms and leeches in the phylum Annelida are also called ________worms because they show true segmentation of their body (the body is divided into external and internal repeating units).
  12. 22. A type of protein fiber found in the extracellular matrix of several types of connective tissue. It is strong and flexible, but resistant to stretching
  13. 24. The part of the neuron that receives impulses from other neurons and sends the impulse to the cell body
  14. 26. The name for a true body cavity.
  15. 27. The extracellular matrix of blood, which is mainly fluid
Down
  1. 1. Animals in the class _____(clams, mussels and oysters) have two hard shells surrounding their body that are held together by a hinge. They also have a poorly developed head and a muscular foot used for digging in the sand.
  2. 2. Evolution of the ______ egg is what allowed reptiles, birds and mammals to colonize dry areas of land.
  3. 3. One of the defining features of a vertebrate is the _______, a cartilaginous rod found between the digestive tract and the dorsal hollow nerve cord, which becomes the vertebral column after development in vertebrate animals.
  4. 5. Tall, narrow-shaped epithelial cells are called ______
  5. 6. The flatworms in the phylum Platyhelminthes have no body cavity and so are called ________(plural).
  6. 7. These sponge cells are able to trap food particles and can also become swimming sperm (plural).
  7. 9. The phylum Porifera (sponges) has this type of body symmetry.
  8. 10. Animals within the phylum Cnidaria (jellyfish, corals) are ____ (plural) because they only have 2 embryonic tissues or germ layers.
  9. 13. The large central cavity inside a sponge.
  10. 18. An animal that is not able to control its internal body temperature using its own metabolic reactions (name means “outside temperature”)
  11. 19. Most animals have three embryonic tissue layers. The middle layer is called the _____.
  12. 23. Class ______ within the subphylum Vertebrata are the jawless fishes like lamprey. This group lacks fins, scales and jaws
  13. 25. This group (plural) of Arthropods are in the subphylum Hexapoda because they have 6 walking legs. They also have 1 pair of antenna, 1 pair of compound eyes and their body is divided into three segments (head, thorax and abdomen).