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OpenStudy (anonymous):
Neural systems of various animals : 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 - hydras - planarians - molluscs - annelids - fish B. annelids - sponges - hydras - planarians - molluscs - fish C. hydras - sponges - planarians - annelids - molluscs - fish D. sponges - hydras - planarians - annelids - molluscs - fish sponges - planarians - hydras - annelids - molluscs - fish
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