How do water's relative densities as a solid and a liquid differ from that of most other substances?

Under normal conditions, water is less dense when in solid form that is in ice form and more dense in its liquid state, meaning that ice can float in water. While other materials are more dense in their solid state and less dense in their liquid state.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

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