Answer:  A. 
Single-celled organisms duplicate their genetic material twice during cell division
Explanation:
All multicellular organisms use cell division for growth and the maintenance and repair of cells and tissues. Single-celled organisms use cell division as their method of reproduction. Somatic cells contain two copies of each of their chromosomes (one copy from each parent).
 
        
                    
             
        
        
        
Answer:
B
Explanation:
t = 2s
u = 0m/s (released from rest)
a = +g = 9.8m/s²
s = H = ?
using,
s = ut + 1/2at²
H = 0(2) + 1/2(9.8)(2²)
H = 0 + 9.8(2)
s = H = 19.6m
 
        
             
        
        
        
Answer:son causados por terremotos, ya que la fuerza de la tierra hace movimiento en las placas tectonicas debajo del mar creando asi los tsunamis.
Explanation:
espero haberte ayudado :)
 
        
                    
             
        
        
        
Answer:
I think it's B
Explanation:
sorry if I got it wrong TvT