If the two sister species on the phylogenetic tree in the figure below differ from the other two species in a single character state (e.g., dark fur, whereas the other taxa have light fur), where would the evolutionary change(s) have occurred? Indicate change(s) by placing an arrow-or arrows-on the tree. Be sure to label the presumed ancestral state, and label the arrow(s) as a "loss" or "gain." 
Definitions:
Environmental Factors
External elements, including social, cultural, and physical elements that influence individuals and their behavior.
Intelligence Scores
Numerical assessments derived from standardized tests designed to measure human intelligence and cognitive abilities.
Monozygotic Twins
Identical twins that result from the division of a single fertilized egg, sharing nearly all of their genetic material.
Oxytocin
A hormone and neurotransmitter often referred to as the "love hormone," involved in social bonding, sexual reproduction, childbirth, and the period after childbirth.
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