*Question*
Answer the following question given this paragraph: An experiment is a controlled scientific study of specific variables. A variable is a factor that can take on different values. Q: What is a controlled scientific study of specific variables called? Choices: - practicum - example - variation - experiment A:
**Answer**
experiment

*Question*
Answer the following question given this paragraph: Q: Living things that feed on others are generally known as what? Choices: - customers - isolators - producers - consumers A:
**Answer**
consumers

*Question*
Answer the following question given this paragraph: Food Chains. These two food chains represent complex systems in nature. They make the systems easier to understand. These are simple conceptual models. Models of very complex systems are often based on mathematical equations or computer simulations. Q: What kind of tool, often based on mathematical equations or computer simulations, helps us understand complex systems? Choices: - levels - planes - panels - models A:
**Answer**
models

*Question*
Answer the following question given this paragraph: Q: How many chambers does the stomach of a ruminant have? Choices: - 5 - 3 - 1 - 4 A:
**Answer**
4