The fossil forms that occur in the rocks, however, provide the chief means of establishing a geologic time scale, with the timing of the emergence and disappearance of widespread species from the fossil record being used to delineate the beginnings and endings of ages, epochs, periods, and other intervals.
The fossil forms that occur in the rocks
Explanation: Trust me
chromosomes carry the genetic information for organisms. also, chromatin is the thread like dna which is located in the nucleus of an organism.
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