Answer:
C
Explanation:
An element is a pure substance that can not be broken down into anything simpler
A compound in also a pure substance held together in fixed proportion through chemical bonds
 
        
                    
             
        
        
        
Explanation:
it can improve muscle strength and boost your endurance. 
it also delivers oxygen and nutrients to your tissues
 
        
             
        
        
        
Answer:
(A) a heuristic
Explanation:
A heuristic:It is a reasoning strategy to find answers, make judgement about any something."
 It is possible to choose between the options given, we have the following interpretation as; Interpretation: "A heuristic: finding answers is a thinking technique, evaluating something." Mechanism: In the heuristic approach the method is to find solutions or answers to a question by choosing the right and optimal compositions.
 
        
             
        
        
        
Answer:
False 
Explanation:
A white dwarf star that is easy to locate and see with small telescopes.