If a classroom experiment involves the use of several unidentified chemical solutions, which factor would be most important in maintaining safety during the experiment?
A: The classroom would have good ventilation.

A large rock breaks into small pieces within 10 years. Which process is most likely responsible for breaking the large rock into small pieces within 10 years?
A: water repeatedly freezing and thawing in a crack

Repeated pesticide use on an insect population can result in some of the insects becoming resistant to that pesticide over time. Which process is responsible for the pesticides no longer being effective on the insects?
A: natural selection

When the wax from a candle drips, the wax has reached
A:
its melting point.