Answer:
All I know is it isn't D. I just did the quiz and got it wrong. If I figure out the right awnser I will tell you.
There are 13 books in the series
It is hard to recover fossils due to the fact that they are under rock that has solidified over thousands and thousands of years. Also, the bones are very fragile so people have to take a lot of time in order to recover the fossils from the ground.
“Either” is the error replace it with “both”
