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Hmmm... I think it is because humans are making Texas drought so the sinkhole formed.
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Can you send the photo of your book.
No not all bonds have the same strength. there are three different kinds of bonds; london dispersion force, dipole-dipole force, and hydrogen bonds. hydrogen bonds are the strongest. i can't describe them very well but a quick google search of each of those will give you the answer
The correct answer is keratin. The protein found in hair and nails is known as keratin. Keratin is produced by the keratinocytes. Keratin is the basic component of the hair and the nails of a human being. It can also be found in the skin cells in the outer layer.