If two nonsister species (any pair of species other than Species 2 and 3) on the phylogenetic tree in the figure below differ from the other two in a single character state (e.g., the nonsister species have light fur, whereas the sister species have dark fur), where would the likely evolutionary change(s) be? Indicate change(s) by drawing an X-or Xs-on the tree. Be sure to label each X as a loss or gain. In this case, assume that the ancestral state was "dark fur." 
Definitions:
Physiological Determinants
Biological factors that influence the functioning of an organism, affecting physical health and behavior.
Emotional Experience
The subjective feeling associated with a state or reaction that involves a complex psychological and physiological response to a particular situation.
Autonomic Activation
The process involving the autonomic nervous system, which controls involuntary bodily functions and responses, such as heart rate and digestion.
Different Emotions
Refers to the variety of subjective experiences associated with distinct feelings, such as happiness, sadness, anger, and fear, each playing a role in human behavior and thought.
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