Which of these is a hard material?

Explanation: Rocks are naturally hard and rigid due to their mineral composition.

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Q: Cells of what category of organisms can be organized at the level of cells, tissues, organs, and organ systems?
Ans: multicellular

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Ans: Amylase

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Ans: Gujarat

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Ans: Pores

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Ans: New York

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Ans: skeletal muscle

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Ans: India

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Ans: Triphala Kwatha

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Q: The human penis contains the urethra, as well as how many cylinders of spongy erectile tissue?
Ans: three