there is no need to find a mate
Answer:
You will measure the rate of your pules and how fast its going.
You need to keep the thing you are doing for example( if your running you have to make the people run the same length as every one else.
I hope this helps :)
Explanation:
Index fossils (also known as guide
fossils, indicator fossils or zone
fossils) are fossils used to define
and identify geologic periods (or
faunal stages).
