What is a trait that is ancestral to all chordates?
a) a jaw bone
b) a notochord
c) an amniotic egg
d) a vertebral column

Organisms that successfully adapt will leave to grownone of the above

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b. a light particle

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous