Control - The ones not given caffeine
Experimental - The ones given caffeine
Independent - Addition of caffeine
Constant - Light
Data - Quantitive
The structure of a carbohydrate(sugars) is Carbon, Hydrogen, and Oxygen.
the answer is plant because it produces it's own food source, and is also provides nourishment for herbivores and other animals.
B. the man's lack of instict
Out of the options I would have to say Penetrating Keratoplasty, I am not sure
