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1. Of scyphozoans, hydrozoans, and ctenophore, which group is more likely to form large
blooms are capable of disrupting ecosystems?
2. Explain the evidence that suggests that cnidarians and ctenophores are diploblastic. Then,
describe the evidence that suggest development in ctenophores may be triploblastic.
3. Describe the gastrovascular cavity structure in the following: hydrozoan, scyphozoan, and
anthozoan polyps. Which one is probably the most efficient at digesting food and absorbing
nutrients?

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