Which structure in the figure produces a protein that helps protect the skin and underlying tissues from heat,microbes and chemicals? 
Definitions:
Trial Balance
An accounting worksheet that sums up the balances from all ledgers into equal debit and credit column figures.
Related Accounts
Accounts in financial statements that are linked or associated with each other, often used to assess the financial health of a business.
Complete Unit
A single item that is ready for sale or use, containing all its necessary parts or components.
Standard Account Forms
Preset templates used for recording financial transactions and keeping track of financial information in accounting.
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