Which of the following is not a synapomorphy of craniates?

what's the importance of morphology used as basis for classifying Cnidarians? does it have more weight than genetics?

Compare and contrast the uses of hydrostatic skeletons and viscoelastic skeletons in Phylum Cnidaria. Describe the characteristics of the two skeletal types, difference in musculature needed for each type, and how they are used in the two main body types (polyp and medusa).

What are the characteristics of all birds? Why do we assume they were a branch of reptilia?

How and why did sponges develop skeletons, given that they were the first animals, there were no predators when they evolved, and the available food for them was floating in the water?

What skeletal structures behind the mandibular arch in the dogfish appear to be homologous with the mandibular arch? What features of the dogfish appear to be homologous with the spiracle? What supportive function does the hyomandibular have in the dogfish?   Fig 13.2  Basic skeletal structures of the head of a small shark known as a dogfish.

Cyclostomes are often thought as of as “primitive” because they lack jaws. In what ways could the heads of cyclostomes be considered to be derived in their own way?

Question #1: What is the adult fate of notochord? Question #2 State five derivatives of neural crests.

Difference between eubateria and and archaebateria?

Based on an evolutionary perspective, do you think the present forms of cnidarians are the best forms of the group? Why or why not?