What is considered a polar molecule because it a) has the ability to freezeb) is made up of hydrogen and oxygenc) has a partial positive and negative charges at each end

How does the molecular clock work? a. it analyzes the brain functionality of two different species.b. it examines and compares the physical characteristics of two different species.c. it illustrates relationships between two different species.d. it compares the number of mutations that exist in the dna of two different species.