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

The first vertebrates to live on land were __________.

Which of the following animals is an amphibian?

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.

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

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

"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