Does T. rex have four limbs?

How would you mark the table?

a) +

b) 0

b) ?

T. rex was a tetrapod.

But did T. rex inherit an amniotic egg?

What would you write in the table?

a) +

b) 0

b) ?

The fossil record for T. rexdoes not indicate the presence or absence of such a feature, so we can't be sure.

Let's move on to a different feature.

Ooops. Remember that tetrapods are animals that inherited four bony limbs. Look for the two small arms and the two legs. Try again!

Ooops. Can we really tell if T. rex was an amniote or not? Try again!