TIME!!

This picture is a cover of the notes of the Biology class arranged by my classmates. The topic of the cover is about “allopatric speciation” and “sympatric speciation”. The design of the cover matches the content well.
There are two boys and two girls on the picture. Both the two girls and the two boys are very similar and distinguishable. One of the boys and one of the girls are members in my class. Can you guess and distinguish them?