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If you teach your dog to sit by giving him a treat for every correct response, this is an example of:
Q28: Americans use about _ times as much
Q31: Parasites often kill their hosts, although they
Q50: Plants from both the chaparral and the
Q56: The conspicuous structures on the surface of
Q63: The productivity of an ecosystem usually _
Q77: Mammals have a _ heart.
Q86: During sexual reproduction, the spores of the
Q92: The _ forms from embryonic and uterine
Q103: In a deciduous oak forest in the
Q104: Overgrazing, overharvesting of trees, and depletion of