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1. A) Comparing digestion between sponges and cnidarians, what are the benefits of developing extracellular digestion in a gastrovascular cavity for the evolution of larger animals? B) A) Explain how bilateral symmetry contributed to motion, predation, cephalization (the evolution of a head and brain) and increased the diversity of animals.
Distinguish between (a) radial and bilateral synmetry; (b) blastula and gastrula; (c) direct and indirect development; (d) complete and incomplete digestive tract; (e) coelom and pseudocoelom.
