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Answer:
The spongocoel, or interior of the sponge, is composed of walls perforated with microscopic pores that allow water to flow through the spongocoel. Researchers now think that the most likely candidate for this "Animal Eve" is the sponges.
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Darwin's theory of evolution by natural selection states that living things with beneficial traits produce more offspring than others do. This produces changes in the traits of living things over time. During his voyage on the Beagle, Darwin made many observations that helped him develop his theory of evolution.
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