Which of the following can you infer from this tree The foll

Which of the following can you infer from this tree?

The following tree is a chronogram of five orchid subfamilies where the relative size of each subfamily\'s clade is proportional to the number of genera in it. Which of the following can you infer from this tree? Two subfamilies of orchids underwent rapid diversification about 60 million years ago. Orchids arose from a non-orchid lineage approximately 125 million years ago. New orchid subfamilies arose in the Oligocene. Orchid evolution slowed during the Pliocene.

Solution

a. two subfamilies of orchids underwent rapid diversification about 60 million years ago.