1. The origin of the coelom in Brachiopoda and its phylogenetic significance.

2. Describe the Chordata phylum (symmetry, Blastopore fate, coelom, germ layers, tissue type, and exoskeleton)

3. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system

4. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system

5. In most deuterostome animals the coelom originates from an outpocketing of the Archenterons during gastrulation

6. C) Coelom forms by a splitting of the mesoderm, the Blastophore becomes the mouth and the cleavage is radial.

7. Annelids are characterized by the presence of METAMERIC SEGMENTATION, a COELOM, well-developed blood and nervous systems, and NEPHRIDIA.

8. B) Coelom forms by a splitting of the mesoderm, the Blastophore becomes the anus and the cleavage is spiral

9. A) Coelom forms by a splitting of the mesoderm, the Blastophore becomes the mouth and the cleavage is spiral

10. Annelids are segmented worms such as earthworms and leeches. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system

11. The Allantois grows rapidly and within ten days completely surrounds the embryo and yolk sac and fills the extra-embryonic coelom between the amnion and chorion

12. Annelida A phylum of coelomate (see COELOM) worms that have a definite head and good metameric segmentation. Anatomically they are more complex than the Platyhelminthes

13. In freshwater Bryozoa, development is within an embryo sac that is an invagination of the body wall of the stationary trunk section of the zooid, bulging into the coelom

14. Annelids are segmented worms with a complete unsegmented digestive system that runs from the mouth to the anus and is separated from the body wall by the body cavity or coelom

15. Annelids have a fossil record stretching back to the Cambrian, and are distinguished from other organisms called "worms" by the presence of a body cavity ( coelom ) and true segmentation, both of which give them an

16. Annelid, phylum name Annelida, also called segmented worm, any member of a phylum of invertebrate animals that are characterized by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided into segments by transverse rings, or …

17. Asteroidea definition is - the class of echinoderms comprising the starfishes, all being unattached, having (1) a star-shaped or pentagonal body, the rays or arms (usually 5 in number) hollow and containing prolongations of the coelom and alimentary and other viscera, (2) a skeleton of calcareous plates and ossicles somewhat loosely united, often allowing the arms great freedom of movement

18. Asteroidea definition is - the class of echinoderms comprising the starfishes, all being unattached, having (1) a star-shaped or pentagonal body, the rays or arms (usually 5 in number) hollow and containing prolongations of the coelom and alimentary and other viscera, (2) a skeleton of calcareous plates and ossicles somewhat loosely united, often allowing the arms great freedom of movement, and (3) a …