Researchers have been transferring to utilizing molecular data like ribosomal RNA sequences as opposed to morphological data to study the evolutionary history of animals

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Researchers have been transferring to utilizing molecular data like ribosomal RNA sequences as opposed to morphological data to study the evolutionary history of animals. Why?

a) Some phyla Vary too widely in morphological characteristics

b) Molecular data can be used to understand the major genetic changes to extrapolate an estimate on the timing

c) Molecular data is investigated and studied in the lab. This is is opposed to how morphological data is gathered

d) Morphological changes usually do not result from molecular changes.