What allowed Darwin and other scientists to look back at ancient organisms and compare them with present-day organisms were the fossil record.
option B. the fossil record
The totality of fossils and their placement in rock formations and sedimentary layers is known as the fossil record, which contains numerous fossilized remains and traces of the most varied beings from the Earth's geological past.
With this information, we can conclude that the fossil record helps paleontologists, archaeologists, and geologists place important events and species in the appropriate geologic era.
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