4 i guess........................
        
             
        
        
        
There are five basic Hardy-Weinberg assumptions:
1. Random Mating -
2. No natural selection - all members of the parental generation survived and contributed equal numbers of gametes to the gene pool, no matter the genotype
3. No genetic drift (random allele frequency changes) - the population is infinitely large.
4. No gene flow - no new alleles were added by immigration or lost through emigration (no migration)
5. No mutation -  There must be mutation equilibrium.
 
        
                    
             
        
        
        
B Carbón dioxide 
Not sure
        
                    
             
        
        
        
To put it simply: Sandpaper