Examine the evolutionary relationships represented in the following figure.Based upon this diagram,the two most closely related species are ______. 
Definitions:
Organ
A collection of tissues within a living being that are specialized to carry out a particular task.
Nitrogenous Wastes
Waste products containing nitrogen that result from the metabolism of proteins and nucleic acids, such as urea and ammonia.
Urinary System
The body's drainage system for the removal of urine, comprised of the kidneys, ureters, bladder, and urethra.
Vena Cava
A large vein carrying deoxygenated blood into the heart; divided into the superior and inferior vena cava.
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