Which of the following are NOT trends that have occurred during the evolution of the central nervous system in invertebrates? A)none of the above – all are trends B)The positioning of nerve chords at the ventral end of the animal C)The development of sensory structures for the detection of gravity, sound and light D)Increasing the size of cerebral ganglia and formation of a “brain” E)The processing of sensory information by neural ganglia and the generation of motor commands

Describe the cnidarian (radiate) nervous system. How is a tendency toward centralization of the nervous system manifested in flatworms, annelids, molluscs, and arthropods?

Which is NOT an example of a structural homology? Please choose all applicable options. a) All vertebrate embryos form pharyngeal pouches.b) Vertebrate forelimbs generally have the same number and a similar arrangement of bones.c) The same group of embryonic cells forms the adult jaw of a perch and of a dog.d) All organisms share a common genetic code.

7) Examine the image of the relatedness of vertebrates represented in this phylogenetic tree. Select all the statements that are supported by this tree.   A) Gray whales are the common ancestor of the Blue and Humpback whales.   B) Blue and humpback whales diverged more recently than either did from the gray whale.     C) The Bryde's whale shares a more recent common ancestor with the Sei whale than with the Fin whale.     D) The blue and the Bryde's whale have more traits in common with each other than with any other two species,     E) Southern minke whales and Northern minke whales have more traits in common with each other than with any other species. Not Graded