The table below shows the age of fossils found in four separate layers of an undisturbed rock:

Fossils In Rock Layers
Layer Fossil in Layer Age of Fossil (million years)
A W 550
B X 240
C Y 680
D Z 450

Which is the topmost layer of the rock?
Layer A
Layer B
Layer C
Layer D

Jenny places a strip of ph paper into a solution. when she removes the ph paper, it has turned yellow-green. what should jenny do next to determine the ph of her solution? a. use a different testing method because the ph paper should not change colors b. place the ph paper into a machine that reads the ph of the solution c. compare the ph paper's color with the color of ph paper from another solution d. compare the ph paper's color with a chart of colors and ph ranges