Question

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Answer 1

Answer:

DOC file extension refers to a word processing document format

EXE file extension refers to a windows app/software

TXT  file extension refers to a notepad/text document

XLS file extension refers to a powerpoint excel /oo excel

Explanation:

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Answer 2

Answer:

upper is correct

Explanation:

the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.

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