Figure: Estimated times of divergence for lineages of animals, based on the aver

Question

Figure: Estimated times of divergence for lineages of animals, based on the average of the genes used in this study. A) Which two of the lineages presented diverged most recently? How long ago did they diverge (based on the midpoint of the range)? B) Based on the midpoint of the range, about how long ago did protostomes and deuterostomes diverge? C) Based on these results, what can you conclude about the origins of metazoans?
Proterozoic Phanerozoic 18 Mollusca Annelida Arthropoda Echinodermata Agnatha Gnathostomata Protostomia Deuterostomia Cambrian Vendian

Explanation / Answer

1. Agnatha and Gnathostomata. they diverge 600 million year ago.

2. Deuterostomes diverge 1200 milion year ago and protostomes diverge 1190 milion year ago

3. Deuterostomes and other groups of minor phyla have evolved from different protist groups independently.

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