A very steeply sloped seafloor
I think the answer is "the older it is"
Reason: I might be wrong but is something (like a shell) gets buried in something (like sand), overtime many things (like dirt, soil, sand, etc.) will be on top of the original. This will make layers. So, the older rock is on the bottom since it has been there for the longest and it gets covered by other stuff (causing the layers).
Hope this helps! :) (If I'm wrong, sorry :( )
When bonding occurs a new substance with new properties is formed.
Answer:
Genetics are important because it'll pass down to your kids - For example, if you have a disease, your child can possibly obtain the disease from you.
