Phenotype refers to the observable traits an organism has. An example is blue eyes, black hair.
        
             
        
        
        
It'll be much cleaner for the environment. 
        
             
        
        
        
The food that is not a good source of complex carbohydrates is milk.
<h3>What is carbohydrate?</h3>
The carbohydrate is one of the six classes of food.  The six classes of food that we have are;  fat, carbohydrates, protein, vitamins, minerals and water. Carbohydrates are made up of glucose molecules as it is a macromolecule.
These molecules are eaten for the purpose of energy because they are broken down in the body to give glucose which is a source of energy in the body.
Thus, the food that is not a good source of complex carbohydrates is milk.
Learn more about carbohydrates:brainly.com/question/14614055
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Because you cannot test it or observe it.
A scientific theory are created through the scientific method, in the scientific method you need to be able observe it and experiment.