Please carefully/completely read and answer all part(s) of each SHORT ESSAY question: One argument that is often made to

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Please carefully/completely read and answer all
part(s) of each SHORT ESSAY question:
One argument that is often made to invalidate
evolution by natural selection is that some features of an organism
are so complicated and need to work together in order so precisely
in order to function that it is impossible for such structures to
arise from simpler ones by the random processes of mutation and
selection: complicated design requires a designer.
Using evidence from real organisms, explain how a complicated
structure can arise from a simpler ancestral feature. You can
use either an anatomical feature or a molecular one.