The lower respiratory tract is sometimes referred to as the tracheobronchial tree, this describes the branching structure of airways supplying air to the lungs, this includes the trachea, bronchi and bronchioles.
        
                    
             
        
        
        
The main determinant of skin color is melanin
        
             
        
        
        
Some strengths are, 
you get faster at answering questions, it’s easier to understand the problems, you have more strategy’s, you understand the ration and percent. you can use graphs and number lines much easier. 
i’m doing mental math right now and this is what we were going over,
i hope it helps
        
             
        
        
        
Answer:
an enzyme that is responsible for copying a DNA sequence into an RNA sequence, duyring the process of transcription. ... For example, all species require a mechanism by which transcription can be regulated in order to achieve spatial and temporal changes in gene expressio
Explanation:
 according to Google