What helps a spider new skin harden?

This process is what results in a larger sized spider following a molt. After the spider expands its exoskeleton and increases in size, the new exoskeleton starts to harden as cross linkages form between chitin and arthropodin, which are the two molecules that make up the exoskeleton.

Explanation:

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a-he encouraged islamic schools to introduce greek texts.

d-he invited greek scholars to teach their texts to the locals.

explanation:

the transmission of the greek classics to latin western europe during the middle ages was a key factor in the development of intellectual life in western europe.[1] interest in greek texts and their availability was scarce in the latin west during the earlier middle ages, but as traffic to the east increased so did western scholarship.

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