If you mean BC not bce, then 1520 years. Plus, this is math…
All of the fossils could be from fish,dinosoures,leaves, or plants. The reason why this could happen is because it could have happened thousand of years ago and the sea level could have been lower.
The total amount of something remains the same.
B,makes more sense especially if you asked a question in the first paragraph!
B ) refers to the pitch or timbre of a persons voice
