IDENTIFYING HIERARCHIES Based on these principles, we can work out the evolutionary relationships of the species we see around us. It is a sort of going backwards in time. We can do this by identif
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TRACING EVOLUTIONARY RELATIONSHIPS When we try to follow evolutionary relationships, how do we identify characteristics as common? These characteristics in different organisms would be similar beca
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FOSSILS Such studies of organ structure can be done not only on current species, but also on species that are no longer alive. How do we know that these extinct species ever existed? We know this f
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EVOLUTION BY STAGES A question that arises here is – if complicated organs, such as the eye, are selected for the advantage they provide, how can they be generated by a single DNA change? Sur
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