Answer:
A
Explanation:
this is because, in smaller organism their SA/V ratio is large hence they have efficient transport of materials within their cells 
 
        
             
        
        
        
Pretty sure it would be the nerves attatched to the heart valve
        
                    
             
        
        
        
Earthquakes only occur at transfer boundaries where two tectonic plates will slide or rub past each other.
If there are no boundaries in mid-America, then earthquakes are not possible.
        
             
        
        
        
Answer: El smog fotoquímico se forma cuando los fotones de la luz solar chocan con moléculas de diferentes tipos de agentes contaminantes en la atmósfera. Los fotones hacen que se produzcan reacciones químicas. Las moléculas de contaminación se convierten en otros productos químicos nocivos, como ya venimos en el laboratorio.
Explanation:
 
        
             
        
        
        
Answer:
the organelle that regulates cell function and contains the DNA is a nucleus