The cladogram of the kingdom Animalia shows the relationship of selected animals based on their shared anatomical features. The black numbered squares represent features that are critical for forming each branch in the animal kingdom. Square one represents a dorsal nerve cord, which means the animals in all the branches have a dorsal nerve cord.
By comparing the characteristics of each animal branch, we can hypothesize that which numbered square would represent the trait "mammary glands?"
A) 3
B) 4
C) 5
D) 6
Answers: 2
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