Scientists test their ideas about things they cannot observe directly by building
Models can help scientists understand a system’s
Input, output, and process are parts of a(n)
Scientists may use a computer to keep track of the variables in a complex
A(n) simple system is difficult to model.
The mercury cycle, water cycle, and rock cycle are all models.
Your heart pumping faster when you exercise is an example of input.
Scientists may make assumptions to simplify a model.
The output of a toaster is electricity.
All models are physical objects.