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Name ______________________________ Class___________________Date__________________ Skills Worksheet Directed Reading Section: Evolutionary Trends in Animals In the space provided, write the letter of the description that best matches each term. _____ 1. body plan _____ 2. asymmetrical _____ 3. radial symmetry _____ 4. cephalization _____ 5. bilateral symmetry a. body parts arranged around a central axis, like the spokes of a bicycle wheel b. sensory structures and nerves concentrated at the body’s anterior c. a term used to describe an animal’s shape, symmetry, and internal organization d. body is irregularly shaped e. body has a distinct right and left half Complete each statement by writing the correct term or phrase in the space provided. 6. The cells of all animals except sponges are organized into structural and functional units called ______________________. 7. In all animals except sponges, the zygote undergoes cell divisions forming a hollow ball of cells called a(n) ____________________. 8. The ______________________ is the layer of cells in the blastula that gives rise to the outer layer of skin, the nervous system, and the sense organs. 9. The ______________________ is the layer of cells in the blastula that gives rise to the lining of the digestive tract, respiratory system, and many glands. 10. The ______________________ is the layer of cells in the blastula that gives rise to most of the skeleton, muscles, and circulatory system. 11. In ______________________, the mouth develops from the end of the embryo near the blastopore. 12. In ______________________, the mouth develops from the end of the embryo opposite the blastopore. 13. Animals with _____________________ _____________________ may have one of three basic kinds of internal body plans. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 5 Introduction to Animals Name ______________________________ Class___________________Date__________________ Directed Reading continued 14. Animals with no body cavity are called ______________________. 15. Animals that have a body cavity between the mesoderm and the endoderm are called ______________________. 16. A true coelom is lined with mesoderm and wraps around the ______________________. Read each question, and write your answer in the space provided. 17. What are the four stages, in order, of embryonic development before differentiation? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 18. What benefit do animals derive from having a coelom? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 19. What are some advantages of body segmentation? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 20. How did the development of jointed appendages benefit animals? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 6 Introduction to Animals