Evolution of new physical traits in mollusks has declined and grown more predictable over time. Early mollusks evolved a unique physical trait once every 2 million years. That frequency began declining roughly 444 million years ago to about one new feature every 9 million years.

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Equal (2): Everything in this space must be equal to 2. The answer is 1-2, placed vertically; 6-2, placed vertically; 2-2, placed horizontally; 2-4, placed vertically.

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