The genetic makeup of an organism is its whereas its physical appearance is its
a. phenotype/genotype
b. fitness/selective value
c. selective value/fitness
d. genotype/phenotype

d. genotype/phenotype

Explanation:

Definition of genotype (Oxford Languages Dictionary);

investigate the genetic constitution of (an individual organism).

Definition of phenotype the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.

I can confirm this is the correct answer.

bc blah

explanation:

bc blah

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.