Final answer:
A testable question is one that can be investigated through scientific methods and experiments. Examples of testable questions related to ghost ants are provided.
Step-by-step explanation:
A testable question is a question that can be investigated through the use of scientific methods and experiments. It should have a clear and measurable variable that can be observed and analyzed. The correct testable questions from the options given are:
- Do ghost ants navigate by smell?: This question can be tested by conducting experiments to determine if ghost ants use smell to navigate.
- Do ghost ants prefer sweet or salty foods?: This question can be tested by conducting experiments to observe which type of food ghost ants are more attracted to.
- Can ghost ants change their roles in the colony?: This question can be tested by observing the behavior and roles of ghost ants in different situations and colonies.