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OpenStudy (anonymous):
Starting with the simplest and moving towards more complex, what is the correct evolutionary sequence of animals in regards to the complexity of their nervous systems? A. sponges - planarians - hydras - annelids - molluscs - fish B. annelids - sponges - hydras - planarians - molluscs - fish C. sponges - hydras - planarians - annelids - molluscs - fish D. hydras - sponges - planarians - annelids - molluscs - fish E. sponges - hydras - planarians - molluscs - annelids - fish
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