6th 2.4 Using Models

Scientists use models to understand things that they cannot observe _______.  

• indirectly
• directly
• thoroughly
•  easily

The tick’s life cycle can be shown in a ______.    

•  system
• complex model
• basic model
• figure

Feedback is a type of _____.  

• output 
• input 
• result 
• reaction

A complex system involves ______. 

•   many interactions
• few interactions
• a model

_____ is what happens in a system. 

• output
• process 
•  input 
•  feedback

A system produces a result or ________.  

• reaction  
• output 
• performs a function
• feedback

A complex or simple ________ can be represented in a model.   

• carbohydrate
• environmental system
• basic model
•  system

A model can show your body’s digestive _______.  

•  model
• picture 
• system
• stomach

Scientists can use models to predict _____ in a system as changes in output or feedback.  

• differences
• changes 
• systems
•   skills

A bicycle is an example of what type of system?   

• mechanical
•  physical 
• simple
• complex