Unit 1 - Zoology

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Across
  1. 2. this diagram show evolutionary relationships based on derived characteristics
  2. 9. this diagram looks like a family tree and shows the relatedness of different organisms
  3. 10. the branch of Biology that studies the evolutionary development of a species
  4. 13. a two part naming system of organisms that include the genus and species names
  5. 16. the branch of science dealing with the classification of organisms
  6. 17. in this type of organism, the initial opening of the embryo develops into the anus
  7. 18. this is a cavity that develops in the early stages of an embryo
  8. 19. the middle layer of an embryo in early development, between the endoderm and ectoderm
Down
  1. 1. circulatory system in which blood is restricted to vessels
  2. 3. organisms with parts that are organized in a circle around a central point
  3. 4. this is the opening of the gastrula (an early embryonic stage) that either develops into the mouth or anus
  4. 5. an animal embryo at the early stage of development when it is a hollow ball of cells
  5. 6. a concentration of nerves and brain structures in the anterior end of an organism
  6. 7. the branch of Biology that deals with the form and structure of organisms
  7. 8. organisms having two similar halves
  8. 11. each of the three layers of cells developed in the early stages of an embryo
  9. 12. the natural covering of an organism
  10. 14. these organisms are: eukaryotic, heterotrophic, multicellular, most can move, cell contain DNA, but cells do not have cell walls or chloroplasts
  11. 15. in this type of organism, the initial opening of the embryo develops into the mouth
  12. 20. circulatory fluid is pumped through the entire body cavity and not restricted to vessels