Based on the figure below, how many groups (clusters) of Hox genes does each type of animal have? 
A. All animals must have at least 2 groups because all animals have a posterior and anterior end.
B. Mammals: 11 groups; Flatworms: 4 groups; Sponge: 1 groups; Anemones: 4 groups.
C. Mammals: 4 groups; Flatworms: 4 groups; Sponge: 2 groups; Anemones: 1 group.
D. Mammals: 27 groups; Flatworms: 4 groups; Sponge: 2 groups; Anemones: 1 group.
E. Mammals: 4 groups; Flatworms: 4 groups; Sponge: 1 groups; Anemones: 2 group.
Answer: E
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