A phylogenetic tree for three species, A, B, and C, is shown below. 
A particular DNA region that is shared by all three species is cloned from each species and sequenced. There are about 100 nucleotide substitutions between A and C and between B and C. There are only 20 differences between A and B. The fossil record indicates that the ancestor to A and B diverged from the ancestor to C around 10 million years ago. What is the best estimate of the divergence between A and B based on this information, assuming a constant rate of mutation and the same rate of mutation on all branches?
Definitions:
Affirmation
A statement of emotional support or encouragement, often used as a technique in positive thinking and self-improvement practices.
Normalizing
The process of making something standard, typical, or expected within a certain context or framework.
Directing
The process of guiding, commanding, or controlling a group or an individual to achieve desired goals or tasks.
Challenging
Presenting a task or problem that is difficult to solve or requiring effort to overcome.
Q1: Protein electrophoresis was the first molecular technique
Q8: Before the advent of molecular techniques, researchers
Q17: GGHH and ccdd individuals are crossed to
Q18: In a cross between AaBbCc and AaBbcc,
Q28: What kind of gene interaction is this?<br>A)
Q37: The _ concept defines a species as
Q39: In a female human cell, what would
Q57: A population that goes through a dramatic
Q59: The ability to roll the tongue is
Q83: A 24-year-old woman with myotonic dystrophy, a