16. (6 pts) Different regions of the frog embryo undergo different motilities during gastrulation. List them: A. Animal cap - epiboly B. Dorsal marginal zone - Involution C. Ventral marginal zone 17. (10 pts) Xenopus and Zebrafish development are both very different and yet very similar. A. In what way is cleavage different? (Names are sufficient.) B. Name one of the ways (region and type of motility) that gastrulation is different. C. What is the result if the embryonic shield is transplanted to the ventral side? D. What is the equivalent structure to the embryonic shield in the frog? E. Name one of the molecules important in early development that is the same in both organisms..