Study the amino acid sequences of the same protein taken from four different species of
plants. which pair of plants is most closely related?

species 1: a-p-a-c-w-
species 2: g-p-g-s-f-
species 3: a-p-a-c-f-
species: -n-k-m-h-h-

a. species 2 and 4

b. species 1 and 3

c. species 3 and 4

d. species 1 and 2