The endocrine system is a collection of glands that regulate your metabolism, growth, sleep, mood and other things around your body.
        
                    
             
        
        
        
Answer:
If there is no dominant allele for a trait present on a homologous chromosome to mask the recessive allele, the recessive phenotype will be expressed. In this case, the gene is located on the Z chromosome. In an individual with a ZW genotype (female) there is no homologous Z partner, meaning whatever allele is present on the solitary Z chromosome will be expressed.
Explanation:
 
        
             
        
        
        
The answer is Mitochondria 
Hope that helps! :)
        
                    
             
        
        
        
Protein breakdown into amino acids is the statement that correctly explains the complex molecule.
Option (c);
<u>EXPLANATION:</u>  
Cells in our body carry put several chemical reactions which in turn keep us healthy. All these reactions are collectively called metabolism. With the breakdown of complex molecules, it releases a lot of energy into the body.Through this process, Proteins are broken down into amino acids. 
Various enzymes, specifically pepsin and hydrochloric acid breaks proteins into individual amino acids. They on further broken into a-keto acids. These amino acids reduces body weight and improves energy in the human body.
 
        
             
        
        
        
The correct answer is True.