The 19^th Century Embryologist K

The 19^th century embryologist K.E.von Baer examined recapitulation and

A) agreed with the theory and added more experimental evidence.
B) totally disproved it with new experiments.
C) contended that early developmental stages were simply more widely shared among different animals than later, more derived developmental stages.
D) refined it to explain heterochrony and paedomorphosis.
E) proposed that it was the key to speciation.