Question

shallowerdeeperwhich of the following fossils is youngest? select the most likely answer.sea urchinshark toothseaweed

Explanation:

Step1: Recall Fossil Layer Principle

In geology (a subfield of Natural Science), the principle of superposition states that in undisturbed sedimentary rock layers, the youngest layers are on top (shallower), and the oldest are at the bottom (deeper).

Step2: Analyze Fossil Positions

The shark tooth fossil is in the shallowest layer (topmost layer in the diagram). The sea urchin is in a middle layer, and seaweed is in a layer below the shark tooth's layer but above the deepest layer.

Step3: Determine Youngest Fossil

Since the shallowest layer has the youngest fossils (due to superposition), the shark tooth, being in the shallowest layer among the options, is the youngest.

Answer:

B. shark tooth