Consider the phylogeny below. 
Segmentation is labeled on the phylogeny for the two groups showing the trait. Why isn't segmentation mapped on the phylogeny at the place indicated by the arrow?
A) The traits mapped on a phylogeny do not represent the number of times the trait has evolved.
B) Segmentation is a result of convergent evolution and evolved twice in protostomes.
C) The loss of segmentation cannot be confirmed in nematodes.
D) It is unclear when segmentation evolved in deuterostomes.
Correct Answer:
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Q123: The _, which includes the sharks, skates,
Q124: Chordates include:
A)tunicates and echinoderms.
B)cephalochordates and arthropods.
C)tunicates and
Q125: Examine Figure 44.31 below. Q126: Nematodes and arthropods look very different from Q127: Why do some biologists use the name Q129: The Osteichthyes, or bony fish, make up Q130: Birds are one of two groups of Q131: The advantages of the amniotic egg include: Q132: Which of the following relationships between groups Q133: Which of the following is NOT a
A)relatively
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