Long necked giraffes are dominant to short necks , the giraffe is heterozygous what is his genotype?
what is his phenotype?

let's say were representing neck length with L,

the genotype of a heterozygous giraffe would be Ll

the phenotype, or physical appearance would be long neck

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

b is the correct answer