optional accumulated depreciation consolidation entry

Assume that the accountant preparing the consolidation worksheet has chosen to make the optional accumulated depreciation consolidation entry. Why does this consolidation entry need to be made each year? Write a short, simple memo to explaining why this is the case.
Please provide a complete, easy-to-understand explanation as concisely as possible. Your explanation should not exceed two or three short paragraphs. Therefore, your explanation should reflect careful thinking and good writing.

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