What trait(s) characterize the vertebrates?a. vertebrae and a craniumb. jaws and a spinal cordc. bony endoskeletond. notochord and post-anal tail

Habitat loss, the spread of a fungal disease, climate change, and pollution are causing severe population declines and extinction in __________.

Vertebrates and tunicates sharea. jaws adapted for feeding.b. a high degree of cephalization.c. an endoskeleton that includes a skull.d. a notochord and a dorsal, hollow nerve cord.

True or false? Both echinoderms and vertebrates have endoskeletons. Explain.

Living vertebrates can be divided into two major clades. Select the appropriate pair.a. the chordates and the tetrapodsb. the urochordates and the cephalochordatesc. the cyclostomes and the gnathostomesd. the marsupials and the eutherians

"In the chordate phylogenetic tree below, fill in the shared derived character that defines each clade.a. Notochordb. Vertebral columnc. Jawsd. Bony skeletone. Four limbsf. Amniotic eggg. Hairs"

What trait(s) characterize the vertebrates?a. vertebrae and a craniumb. jaws and a spinal cordc. bony endoskeletond. notochord and post-anal tail

A lamprey, a shark, a lizard, and a rabbit share all the following characteristics excepta. pharyngeal slits in the embryo or adult.b. vertebrae.c. hinged jaws.d. a dorsal, hollow nerve cord.

In Figure 34.25, which of the following is the sister taxon to the archosaurs? (A) synapsids (B) crocodilians (C) turtles (D) lepidosaurs