Vertebrates are most closely related to:
a) cephalopods.
b) tunicates/sea squirts.
c) insects.
d) earthworms.
e) jellyfish.

The distribution of related animals and plants across the world

Why is it important to study each branch of earth science?

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d