Cause: Nicole discovered a dinosaur fossil in her backyard

Yes.

Explanation:

Nicole discovered a dinosaur fossil while playing in her backyard which indicates there is a dinosaur present millions of years ago on these lands. The dinosaur were present about 1.2 millions pf years ago but were extinct due to change in climatic condition and unavailability of food in this region. At that time, this place has different climate and environment so they survived at that time but now extinct due to change in environmental condition.

c: in the east might be the correct answer

answer; nearly half;