It’s critical because it checks the cell for problems or mutations that could potentially harm it in later steps or make it like burst lol
Why did you write the last part I don’t get it I’m
The correct answer is: Layer 1, layer 2, and layer 4 in all three regions.
The index fossils are fossils that are commonly used for identifying a geological period of time, and these fossils are also very wide spread, as well as having a rapid evolutionary trends.
By this picture, we can easily see that even though we have rock strata from different regions, the same layers contain the same fossil, and it is a fossil that also is rapidly evolving so has a minor change in each layer.
I think either rapid of human population growth or global warming