Across
- 4. a light-emitting organ which appears as luminous spots on various marine animals
- 5. animal with cartilaginous shell developed from their ribs
- 6. flexible rod-shaped in embryos of all chordates
- 7. reptiles and birds
- 9. the change in the inherited characteristics of biological populations over successive generations
- 10. section made up of axial and appendicular skeleton
- 12. pouched marsupials
- 14. mouth arises from opposite side of Blastopore
- 16. jawless fish
- 17. outgrowths of skull beneath the integument which forms a keratinized sheath
- 18. glandular portion of avian digestive tract
- 21. multiple generations of tooth replacement
- 23. a clade in which groups formed on a basis of nonhomologous characteristics
- 24. glands which are connected to hair follicles,producing sebum
- 25. top layer of skin
Down
- 1. features which are similar in appearance
- 2. placental mammals
- 3. flexible connective tissue found in many areas such as joints between bones, nose
- 7. germ layer of skin
- 8. responsible for protection, gland secretion, exchanges, sensory signal reception
- 11. process by which food is crushed and ground by the teeth
- 13. two parallel forces pulling on bone
- 15. specialized feather used as display in mating rituals
- 19. pigmented cells of skin
- 20. scales found on sharks
- 22. master switch genes; controls hundreds of secondary genes