Based on the information provided about the fossils in rock layers, the correct completion for the statement would likely be:
"the mammal fossils and the amphibians fossils are younger than the trilobite fossils."
This stems from the general principle of rock layer formation, where deeper layers (or rock layers) tend to be older than shallower ones. Since trilobites are mentioned in the deepest rock layer, they would be older than amphibians, which are in the shallower rock layer. Therefore, the fossils of dinosaurs, which are typically found in younger layers, would be younger than both trilobite and amphibian fossils.
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