Nitrogen — 78 percent.
Oxygen — 21 percent.
Argon — 0.93 percent.
Carbon dioxide — 0.04 percent.
The answer is D. Sedimentary rock takes millions of years to form since sedimentary rock is formed by sand cementing together over long periods of time.
The answer is D) replication.
Replication is the process by which a cell makes a copy of the DNA. It's important for cells to replicate to account for all the splitting of cells that occurs. This happens so new cells can be created.
Hope this helps! :)
