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.

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

Explanation:

A molecular clock is a genetic tool often used in Evolutionary Biology which states that the genetic material and proteins evolve over time at a relatively constant rate. Therefore, the differences in their genome depend on the common ancestor both species share.

In this case, clams and squid are more closely related than clams and snails. Therefore, they have been evolving separately for a shorter time than clams and snails.

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

substitution is the answer in this case