Very old
Ancient
In a way that does not take a lot of time
Briefly
Most likely
Possible
An animal or plant preserved in rock
Fossil
Extra
Additonal
Someone who studies the history of the Earth
Paleontologist
To appear in the world
Exist
The process of finding things similar or different
Comparison
Very large or heavy
Massive
Roughly; about
Approximately
To begin to grow
Sprout
A small piece of a larger object
Fragment
Sharing qualities with something not the same
Similar