In the following reaction, identify X. 
Definitions:
Intellectual Disability
A generalized neurodevelopmental disorder characterized by significantly impaired intellectual and adaptive functioning.
Autistic Spectrum Disorder
A range of developmental disorders characterized by difficulties in social interaction, communication, and by restricted or repetitive patterns of thought and behavior.
Motor Skills Disorder
A condition that significantly impairs an individual's coordination and movement abilities, affecting daily activities and tasks.
Global Population
The total number of human inhabitants on the planet Earth at any given time.
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