Answer:
Hypothesis. A Hypothesis is an estimation of what might happen and the student's observation before moving on to investigate.
 
        
             
        
        
        
Threatened is the definition used when describing a species at risk of extinction
        
                    
             
        
        
        
Answer:
the answer is true.
Water concentrates water-soluble human waste products. 
 
        
                    
             
        
        
        
Answer:
18 ATP.
Explanation:
Total 18 ATP are produced because 9 FADH2 are converted into 9 ATP molecules and the earlier 9 ATP molecules are already present in the first b-oxidation process. The first Krebs cycle produces 27 NADH, 9 FADH2 and 9 ATP while on the other hand, the second Krebs cycle produces 9 ATP molecules from  9 FADH2 so total it produces 18 ATP molecules.