<span>Regarding a product or service, quality assurance is used to detect hidden faults. Quality assurance, is a team known as QA, that tests products before they go out into the market to make sure they pass quality tests. The main goal is to make sure little to no products are on the shelf with any defaults that the company can see. Although some may slip through the cracks, the quality assurance team prides themselves on finding any hidden faults. </span>
B overstepping its authority
<span>The 'power to command or influence thought, opinion or behavior' is the definition for authority.
Authority refers to the ultimate power someone can have over somebody else - it means that you can control what they do, say, or behave like, because they cannot afford to disobey you. Usually leaders have ultimate authority over everyone else.
</span>
Answer:
The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes.
Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.
Extracting iron filings from a mixture of sand with a magnet is absolutely no change. That's merely separating items that got mixed up.
