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Fossil evidence suggests dinosaurs first emerged in _______________.

Which of the taxa below includes dinosaurs and their very close relatives?

Which of the following is the correct order of eras from newest to oldest?

Since many flightless dinosaurs were found to exhibit feathers, what other functions are feathers useful for?

What is the reason for permineralization?

A chewing mechanism adopted by ornithopods that helps them efficiently chew through the toughest of plant materials by moving their upper jaws is called _________. 

Identify the amniotic skull type below:

What can affect an animal carcass’ condition that could prevent fossilization? Please choose all of the correct answers:

What can be considered a type of fossil?

Mastication begins after food passes beyond which of the following structures?