I want to know the answer to the following question:
What do deuterostomes and protostomes have in common?
All the background I'm provided with is that "In most protostomes, cells simply fill in the interior of the gastrula to form the mesoderm, called schizocoelous development, but in deuterostomes, it forms through invagination of the endoderm, called enterocoelic pouching.". Is that enough to answer the question?