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AlexFokin [52]
3 years ago
7

What is the name for nonmetallic minerals that are valued for their beauty and rarity rather than their usefulness?

Biology
1 answer:
Vedmedyk [2.9K]3 years ago
7 0

Answer;

-Gemstones

Gemstones are nonmetallic minerals that are valued for their beauty and rarity rather than their usefulness.

Explanation;

-Most gemstones form in the Earth's crust; the top layer of the Earth, with a depth of 3 to 25 miles. Only two gemstone varieties, diamond and peridot, form in the Earth's mantle, which represents 80% of the Earth's volume.

-A few gemstones form in the mantle, but all gems are mined in the crust. A precious gemstone has beauty, durability, and rarity, whereas a semiprecious gemstone has only one or two of these qualities.

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The gastrointestinal wall is composed of four layers or tunics:

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The innermost tunic of the wall is known as the mucosa or mucous membrane layer. The digestive tract's lumen is lined with it. The mucosa comprises epithelium, a layer of lamina propria, a loose layer of connective tissue, and the muscularis mucosa, a thin layer of smooth muscle.

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brainly.com/question/13153021

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2 years ago
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Answer:

The correct answer is (d)modified guanine nucleotide.

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