Based on the principle of superposition, which states that in an undisturbed sequence of rock layers, the oldest rocks are found at the bottom while the youngest rocks are at the top, the organism's fossils that would be expected in the deepest layer of rocks in Earth's crust would be the Megalodon.
Here's why:
1. Megalodon lived the furthest back in time compared to the other organisms listed.
2. The time period of the Megalodon, ranging from 23 million to 3.6 million years ago, places it the furthest back in history among the given species.
3. Therefore, based on the principle of superposition, Megalodon's fossils would be found in the deepest layers of rocks in Earth's crust compared to the other organisms listed.
So, in this case, the correct answer would be:
D. Megalodon
