Question

a scientist is trying to determine the relationship between clams, snails, and squid. when she generates a molecular clock, she is surprised to see that clams and squid are more closely related than clams and snails. which did the molecular clock data show?
clams and squid have been evolving separately for a longer time than clams and snails
clams and squid have been evolving separately for a shorter time than clams and snails
clams and snails have more in common genetically than clams and squid
clams and snails are more similar in related structures than clams and squids

Explanation:

Molecular clocks measure genetic differences to infer evolutionary relatedness: fewer differences mean closer relatedness and shorter time since divergence. Clams and squid being more closely related implies they split from a common ancestor more recently than clams and snails.

Answer:

Clams and squid have been evolving separately for a shorter time than clams and snails.