What's this?
It's a mouth/This is a mouth.
What's this?
It's a plant eater dinosaur./This is a plant eater dinosaur.
What's this?
It's a meat eater dinosaur./This is a meat eater dinosaur.
What's this?
They're teeth./These are teeth.
What's this?
It's a canyon./This is a canyon.
What's this?
It's a dinosaur./This is a dinosaur.
What's this?
It's a fossil./This is a fossil.