Because we have smelled them so long we are used to them
        
             
        
        
        
Answer:
The correct answer is - proteins.
Explanation:
Enzymes are made up of the long chains of amino acids that are linked by the peptide bonds that make a polypeptide chain known as proteins. Proteins are the building block of the enzyme and the building of thevarious structures in the body.
Enzymes are made up of two protein that also plays as the role of a biological catalyst whereas protein only plays role in forming different structure and performing functions.
 
        
             
        
        
        
Answer:Planarians = flatworms
Marine worms = segmented worms
Pinworms = roundworms
Tapeworms = flatworms
Explanation:
I’m Built Different 
 
        
             
        
        
        
Answer:
D is rhe answer of rhis question. 
Explanation:
collection of cells make tissue, collection of tissues form organ, similarly group of organs combine to form a system and when these systems combine it forms a whole body of organism.