Q: Answer the question

Sterling silver is a combination of silver and copper. Which of the following is also a combination of two or more metals?

A: brass.

Q: Answer the question

Moving water was the most important factor in forming which of these?

A: the Grand Canyon

Q: Answer the question

The process of digestion breaks down proteins into smaller molecules that are used to rebuild other proteins. During digestion, proteins undergo

A:
chemical changes.