Question

are sharping a pencil and cooking useful changes or harmful changes​

Answer 1

Explanation:

For what purposes are they produced? Many changes such as sharpening a pencil, baking bread, cooking food are useful to us and these are, therefore, called useful changes. The changes that are not useful or changes that do us harm are called harmful changes.

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Answer 2

For what purposes are they produced? Many changes such as sharpening a pencil, baking bread, cooking food are useful to us and these are, therefore, called useful changes. The changes that are not useful or changes that do us harm are called harmful changes.