Flatworms possess excretory organs known as nephridia. Specifically as annelids, flatworms possess a variant known as metanephridia.
 
        
                    
             
        
        
        
Answer:
to do this we need to know the question
Explanation:
 
        
             
        
        
        
Answer:
way of seeling and product that he/ she is seeling
 
        
             
        
        
        
Answer:
Genetics are important because it'll pass down to your kids - For example, if you have a disease, your child can possibly obtain the disease from you. 
 
        
             
        
        
        
Answer: 20 amino acids 
Explanation:
The Genetic code permits the triplet nature of codons whereby three nucleotides from Adenine, Uracil, Guanine and Cytosine on the messenger RNA (mRNA) join to form 64 codons.
 Since more than one codon can specify for an amino acid, the 64 codons then specify for 20 amino acids, that then form the sequence of various proteins