ou find a flatworm during a field trip and discover that the embryos undergo spiral cleavage. What also must be true of this animal? (can be more than one anwser) E. regulative development B. mosaic development C. it is acoelomate D. All of these A. bilateral symmetry
You find a
E. regulative development
B. mosaic development
C. it is acoelomate
While the cleavage pattern has remained remarkably consistent among taxa, it has undergone numerous changes. The precise methods by which diverse adaptations have altered the ancestral spiral cleavage pattern are a key continuing evolutionary question, and answering it requires a thorough understanding of the developmental biology of many spirally cleaving taxa. The spiral cleavage program has been lost or drastically changed in most flatworms (Platyhelminthes). Polyclad flatworms, on the other hand, have kept the pattern all the way up to the 32-cell stage.
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