Let's start with vertebrae.

Look at the T. rex skeleton below. What would you write in the table for T. rex?

a) + (T. rex has vertebrae)
b) 0 (T. rex does not have vertebrae)
c) ? (we don't know if T. rex has vertebrae or not)

But did T. rex have a bony skeleton?

What would you write in the table?

a) +

b) 0

b) ?

Ooops. Does T. rex have a backbone or not? Try again!

Ooops. Look more closely at the picture to see if T. rex has a backbone or not. Try again!

Ooops. Look more closely at the picture to see if T. rex has a skeleton made of bone. Try again!