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B
Aristotle
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C
Von Baer
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D
Dollo
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Solution
The correct option is A Ernst Haeckel Origins of modern embryology. Karl Ernst Von Baer and Heinz Christian Pander proposed the germ layer theory of development; Von Baer discovered the mammalian ovum in 1827. Modern embryological pioneers include Charles Darwin, Ernst Haeckel, J.B.S Haldane and Joseph Needham.