Answer:
I think the third one......
Answer:
Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
2. Increases
but you might have to double check this
<span>Gravity acts on all objects in the universe.</span>
All can be used to make a new scientific law .
