Across
- 7. He was known for his vertebral theory of the skull.
- 10. Refers to how the part is used in the environment during the course of the organism’s life history.
- 11. Sea squirts belong to the subgroup of Urochordata called?
- 14. The pharyngeal slits are also called?
- 16. He was well known for opposing Darwin’s theory and did not believe in the transmutation of species.
- 20. The losest a pterobranch comes to possessing a central nervous system is called collar _____?
- 23. Groups that include a common ancestor and some, but not all of its descendants.
- 25. He wrote The Evolution of Man, in which he depicted the human phylogeny.
- 26. As adults, protochordates usually live within the bottom marine substrate.
- 29. He referred to the vertebrate evolution as the “vertebrate story.”
- 33. Refers to the retention of some larval characteristics in the adult.
- 34. The nerve tube typically form by a distinctive embryonic process called?
- 36. They possess some of the five characteristics that define a chordate.
- 39. Tunicates belong to this group.
- 40. Along with Patten, he revived the issue that chordates evolved from annelids and arthropods.
- 41. Enteropneusts have three body regions: proboscis, trunk and?
- 42. They are sometimes called the ascidian tadpole.
- 46. The period when the first vertebrates appeared.
- 47. The Mississipian and Pennsylvanian periods are also known as?
- 48. In truly segmented animals, it sequentially subdivides the hydrostatic skeleton into a series of internal compartments.
Down
- 1. Acorn worms belong to this group.
- 2. Chordates evolved within what?
- 3. Huxley was associated to this animal for his advocacy to Darwin's theory of evolution.
- 4. Groups that include the ancestor and all of the descendant groups.
- 5. Both sexes occur in the same individual.
- 6. Specifying general regions of an embryo is termed as?
- 8. He proposed that chordates originated from echinoderms.
- 9. He proposed a progressive change in species along an ascending scale, from the lowest on one end to the most complex and perfect.
- 12. It pertains to an organism’s anatomical structure that is coincidentally highly suited to a new environment and enhances its probability to survive.
- 13. It is a slender rod that develops from the mesoderm in all chordates.
- 15. A taxonomic group within the hemichordates usually in their sessile form.
- 17. Meaning pointed at both ends.
- 18. This tail is prim.arily an extension of the chordate locomotor apparatus.
- 19. It recognizes similar features that look alike, but was not inherited from a common ancestor.
- 21. A biological blueprint upon which an organism was built.
- 22. It is restricted to mean the action or property of a part as it works in an organism.
- 24. Slits first evolved and aided primarily in what?
- 27. He recognized that organisms are complex functional wholes.
- 28. The kind of systematics that classifies species based on the most obvious similarities between them.
- 30. He wrote the book in which the theory of evolution by natural selection was based from.
- 31. In pterobranchs, each contributing individual to the colony is called what?
- 32. The hypothesis which states that chordates originated from echinoderms.
- 35. It is the oldest likely cephalochordate recovered from Canada.
- 37. One of the few modern sciences that addresses the natural unity of both structure and evolution.
- 38. A state wherein traits are inherited from the most recent common ancestor.
- 43. An example of this is the wings of a bat and the arms of a human that are composed of the same bones namely radius, ulna and humerus.
- 44. The plane which separates the anterior and posterior portions.
- 45. The mucus produces a mid-ventral food-groove called?