This answer is true Geographic isolation is the main cause of speciation.
Hybrid organisms always produce sterile offspring.
If a population is spread out over too large area, they may become extinct.
The answer is
D. Spain
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This type of supporting material is a definition.
A definition is an explanation of what something is or represents or stands for - so in this case, the definition of a binge drinker is a person who drinks a certain amount of drinks in one sitting.
An analogy would be a comparison to something else, an illustration is self-explanatory, and an opinion is a personal feeling about something.