Adominant allele (k) is necessary for normal hearing; kk individuals are deaf. a dominant allele (m) on a different locus results in deafness no matter which other alleles are present. if a kkmm individual is crossed with a kkmm individual, percent of the offspring will be deaf. 75 100 0 25 50

75 % will be deaf

Explanation:

K is dominat allele                 kk are deaf  

M results in deafness  

So cross between            kkMm             x                Kkmm

           Alleles will be        kM                 x                  Km

                                          k                      M

                           K             Kk                     MK

                           M            Mk                    MM

Kk normal      

MK     deaf    

Mk    deaf  

MM     deaf            

so 75%  deaf   and  25 % normal

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.