Testable questions: How will the grass growth rate affect the rabbits? Questions:
what is the manipulated variable, responding variable and the constant?

the manipulated variable is the growth rate of the grass, or the amount of food the rabbits have. the responding variable is the rabbits themselves. the constant is everything else in the scenario. the environment, the predators, etc.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.