16.     which extinction event is responsible for wiping out non-avian dinosaurs?  
            a.  the silurian extinction    b.  the permian extinction    c.  the devonian extinction    d.  the cretaceous-paleogene extinction 

The correct option is the D. The Cretaceous-Paleogene extinction

Explanation:

Although the events of this mass extinction are not completely clear, it has been determined that the non-avian dinosaurs did not have the ability to protect themselves from the stress that the earth was being subjected to at that time, ectothermic species like crocodiles, which had limited needs for food, found that as an advantage for survival.

s the president shall be commander in chief of the army and navy of the united states, and of the militia of the several states, when called into the actual service of the united states; he may require the opinion, in writing, of the principal officer in each of the executive departments. sooo yeahhh

explanation:

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.