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

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

A60-tooth gear is connected to a 72-tooth gear.if the smaller gear turns 12 times,how many turns does the larger gear make?

The (blank) states that all loving things are made of cells.