Answer: draw a punnett square to help you
Genotypes: 50% DD 50% Dd
Phenotypes: 50% normal 50% carriers
None of the cats are deaf (unless they are male, they can have a chance of getting it)
Four abiotic factors in a prairie ecosystem would be soil, climate/temperature, water, and oxygen. Hope this helps!
It is not common but yes an ab parent can have an O child