Q: Which is an example of a chemical change? ----

A: a rusting car fender

Q: Which human body system produces the hormones that regulate growth? ----

A: endocrine

Q: Which of the following elements is best able to combine with itself and hydrogen [H] to form large molecules? ----

A: carbon [C]

Q: Because sulfur cannot be decomposed by simple chemical methods into two or more different substances, it is classified as ----
A: an element.