(; -; )scientists use a basic principle called the law of superposition to determine the relative age of a layer of sedimentary rock. the law of superposition states that undisturbed rock layers are older than the layers above it and younger than the layers below it. which of these statements is supported by the fossil evidence provided?

a) the diversity of life forms decreased over time.

b) animals existed in the earliest fossil record and then became extinct.

c) animals with bony skeletons emerged at layer 3 and continued to appear in newer layers.

d) life existed on land until layer 3 when a flood most likely occurred and introduced sea life to the area.