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? A:
OPTIONS:
- levels
- planes
- panels
- models
Answer: models

input with options: Answer the following question given this paragraph: Muscle contraction occurs when muscle fibers get shorter. Literally, the muscle fibers get smaller in size. To understand how this happens, you need to know more about the structure of muscle fibers. Q: What occurs when muscle fibers get shorter? A:
OPTIONS:
- muscle extension
- muscle tension
- muscle diffusion
- muscle contraction
output: muscle contraction

Q: Answer the following question given this paragraph: Reactivity is the ability of matter to combine chemically with other substances. Some kinds of matter are extremely reactive; others are extremely unreactive. For example, potassium is very reactive, even with water. When a pea-sized piece of potassium is added to a small amount of water, it reacts explosively. You can observe this reaction in the video at the URL below. ( Caution: Don't try this at home!) In contrast, noble gases such as helium almost never react with any other substances. Q: The ability of matter to combine chemically with other substances is known as? A:

OPTIONS:
- turbidity
- solubility
- permeability
- reactivity

A: reactivity

input: OPTIONS:
- migration
- differentiation
- evolution
- natural selection Now, answer this question: Answer the following question given this paragraph: The other idea is that evolution occurs by natural selection. Natural selection is the process in which living things with beneficial traits produce more offspring. As a result, their traits increase in the population over time. Q: Under which process do living things with beneficial traits produce more offspring? A:
A:
output: natural selection

Answer the following question given this paragraph: Q: What type of molecules are secreted by the cell in local signaling? A:

OPTIONS:
- word molecules
- negaitive molecules
- sleeping molecules
- messenger molecules

Answer: messenger molecules

Q: Answer the following question given this paragraph: Grain boundaries. As a polycrystalline material solidifies, grains with irregular shapes form. The interfaces between grains constitute grain boundaries. (Squares represent unit cells within grains. Q: As a polycrystalline material solidifies, grains with irregular shapes form. the interfaces between grains constitute grain what? A:

OPTIONS:
- waves
- patterns
- obstacles
- boundaries

A:
boundaries