Most of today's animal phyla appear in the fossil record within a short span of 25 million years beginning about 530 MYA. When researchers analyzed the DNA evidence that might relate sponges to the modern phyla, what unexpected result did they find?
A. Many development genes thought to be specific to eumetazoans were found in sponges.
B. The entire genome of sponges was found to be very different in gene diversity from the genomes of other phyla.
C. Samples of the living sponge Oscarella carmela were found to be relatively unchanged from fossil sponge DNA samples.
D. Most of the developmental genes found in eumetazoans are absent in the sponge Oscarella carmela.
E. All of the answer choices are correct.
A. Many development genes thought to be specific to eumetazoans were found in sponges.
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