The question refers to the following evolutionary tree, in which the horizontal axis represents time (present time is on the far right) , and the vertical axis represents morphological change. 
Which conclusion can be drawn from this evolutionary tree?
A) A single clade (that is, a group of species that share a common ancestor) can include species that formed by gradualism and other species that formed by punctuated equilibrium.
B) A single clade (that is, a group of species that share a common ancestor) will either include species that formed by gradualism or species that formed by punctuated equilibrium.
C) Assuming that the tip of each line represents a species, there are five extant (that is, not extinct) species resulting from the earliest common ancestor.
D) Species X and Z best represent species that evolved by punctuated equilibrium.
Correct Answer:
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