Question

multiple choice question a scientific model is a test of the effect of one variable on another using a control. a factor that does not change regardless of experimental conditions. an idea, an event, or object to help people better understand something they are testing. only needed for things that we cannot see.

Explanation:

A scientific model is a representation (could be an idea, object, or event) that helps in understanding phenomena, especially those that are difficult to observe directly. It is not just for things we can't see, and it's not a test of variable - variable effects (that's an experiment with controls), nor is it a non - changing factor in experiments.

Answer:

an idea, an event, or object to help people better understand something they are testing.