Nothing is opposing an object falling to earth. Gravity is causing an object to fall back to earth which is opposing the object from leaving earht. If anything the force that opposes gravity is the force at which an object is projected.
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A sympathomimetic drug mimics the physiological effects caused by the stimulation of the sympathetic nervous system. Note the keyword : Mimic A sympatholytic drug oppses/ blocks the physiological effects caused by stimulation of the sympathetic nervous system HOPE THIS HELPS! :)