The answer you are looking for is chitin.
According to a page that I found with info on the subject,
"All arthropods have bodies divided into segments and covered with a hard EXOSKELETON. This tough casing is made of a protein called chitin, which is also found in human fingernails."
https://www.factmonster.com/dk/encyclopedia/nature/arthropods
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The answer is because its crystal cools quickly. Obsidian rock usually forms when cooling happens instantly.
Hope this helps!!
Answer:
crop rotation?
Explanation:
it would help the soil. so like every other year, if you plant a heavy nitrogen using plant like corn, the next year plant a nitrogen depositing plant like soybeans so the soil stays healthy and fertile