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Different organisms may share similarities.
One kind of similarity is functional, e.g butterflies have wings for flying
and so do bats. [analogy]
But the two animals are constructed very differently.
Another kind of similarity
structural, but the structures are used for different functions. [homology]
Elizabeth. 1977. Haeckel’s embryos: fraud rediscovered. Science 277 (5 September):1435.
to Richardson, Michael K., Hanken, J., Gooneratne, M. J., Pieau, C., Raynaud, A., Selwood, L., and Wright, G. M. 1997. There is
no highly conserved embryonic stage in the
vertebrates: implications for current theories of evolution and development. Anatomy
& Embryology 196: 91-106.
Dr. Gish also mentioned an article in the
London Times entitled “Embryonic Liar”