The correct responses for what the two changes have in common are:
- Both conserve mass (since both rust formation and the growth of snails involve the transformation of materials without a loss of mass in a closed system).
The other options can be analyzed as follows:
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Both are only physical changes: This is incorrect. Rust forming on a metal gate is a chemical change, while snails growing shells involves biological processes that result in the formation of a hard structure, but it can be considered primarily a physical process (albeit with a biological aspect).
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Both are chemical changes: This is incorrect for the same reason mentioned above; rusting is a chemical change, but growing shells is not classified strictly as a chemical change.
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Both are changes in state: This is also incorrect as it does not accurately describe either process; rust forming does not involve a change in physical state (e.g., solid to liquid), and snails growing shells is a biological growth process rather than a simple state change.
So the best response is:
- Both conserve mass.
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