Which of the following actions is most likely part of a test to find the hardness of a mineral sample? OPTIONS:
- heating the sample on a hot plate
- scratching the sample with a nail
- hitting the sample with a hammer
- shining a bright light on the sample
A: scratching the sample with a nail

A student poured some sugar into a glass of water. After the water was stirred, no solid sugar remained in the glass. Which statement best describes what happened? OPTIONS:
- The sugar reacted with water to form elements.
- The sugar reacted with water to form a mixture.
- The sugar dissolved in water to form a solution.
- The sugar dissolved in water to form compounds.
A: The sugar dissolved in water to form a solution.

Which is an example of a chemical reaction? OPTIONS:
- The melting of ice
- The grinding of salt crystals to powder
- The burning of wood
- The evaporation of water from a puddle
A: The burning of wood

Onions can reproduce from bulbs. One parent bulb generates daughter bulbs with duplicate genetic information. Which is the most likely advantage of this kind of reproduction? OPTIONS:
- Population size remains constant.
- Beneficial mutations are inevitable.
- Genetic variation is maximized.
- Large quantities of individuals can be produced rapidly.
A:
Large quantities of individuals can be produced rapidly.