Tom wanted to test his hypothesis that plants grow better at room temperature than in cold temperatures. He placed an ivy plant in the refrigerator, which had no light source.He also placed a spider plant in the window in his room.

Question

Tom wanted to test his hypothesis that plants grow better at room temperature than in cold temperatures.  He placed an ivy plant in the refrigerator, which had no light source.He also placed a spider plant in the window in his room.  
b. What were Tom's controls? 
Is it the refrigerator and window?

alex · Answer

refrigerator and window

Lucy · Answer

This did not help me , sorry but I need more help !

Anonymous · Answer

Refrigerator and Window because they're the one experimental controls.