Ageologist finds four layers of sedimentary rock. she determines that no geologic events have shifted the layers. she labels
the layers a, b, c, and from the top to the bottom.
which statement about these layers is accurate?
as older than b.
bis older than c.
c is younger than a.
b is younger than d.
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D-B is younger than D.

Explanation:

In sedimentary rocks, the bottom layers are older that overlaying layers. This is because sediments are placed on top of each other by surface runoffs to ocean beds. Therefore, the first sediments to be deposited will always be towards the bottom as more and newer ones are brought in and deposited.

the cell theory states that all living things including animals, as well as plants, are made of cells.