Describe how fossils us understand the past

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.

In a cladogram' when does a group of organisms branch off

Along what geographical feature are most of the oil producing regions located