Normally they have equal protons and neutrons
        
                    
             
        
        
        
From an area of high concentration to an area of low concentration.
        
             
        
        
        
2. Ionophores because they are class of proteins that move cell membranes. They are small, hydrophobic molecules that increase a cell's permeability to certain ions.  
        
             
        
        
        
Answer:
The options are
A.Independent assortment
B. Mutation
C. Crossing over
D. Non disjunction 
The answer is A.Independent assortment
Explanation:
Independent assortment of genes involves the separation of genes during the formation and development of reproductive cells.
A boy has XY chromosome and a lady has XX chromosomes. This explains why Sue inherited the mother's copy of chromosome 13 but their father's copy of chromosome 14 while her brother Billy inherited their father's copy of both chromosomes 13 and 14. He inherited both due to the presence of XY chromosomes.
 
        
             
        
        
        
The organelle that maintains pressure against the cell wall, so that the plant cell keeps it shape, is
the (a) central vacuole.