Question

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Explanation:

In geological layers, the deeper the layer, the older the fossils (principle of superposition). Layer 6 is higher (more recent) than lower layers. Fossils older than 540 million years are typically in deeper layers; younger (less than 540 million years old) would be in upper layers like layer 6. Option A is wrong as not all fossils are that old. Option B: layer 2 is deeper, so fossils there should be older (more than 540 million years old). Option D: there's no layer 9 in the diagram. So C is correct as layer 6 is upper, fossils there are younger (less than 540 million years old).

Answer:

C. Fossils in layer 6 are less than 540 million years old.