Question: 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: Q: What occurs when muscle fibers get shorter? A:
OPTIONS:
- muscle extension
- muscle tension
- muscle diffusion
- muscle contraction
output: muscle contraction

Q: 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: Q: Under which process do living things with beneficial traits produce more offspring? A:
A:
output: natural selection

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: 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