1. Ok 2. The wolf population...
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AnonymousThe wolf's eating habit has changed somewhat in recent years.The wolf's eating habits have changed somewhat in recent years
Anonymousspecies of the wolf.It's possible, but awkward. It would be simpler just to use the plural, wolves.
AnonymousThe population of the wolf has been declining sharply in recent years.Would be simpler as: The population of wolves has been declining sharply in recent years. or; The wolf population