Which of the following statements about autism spectrum disorder is incorrect? a. exposure to environmental pollutants such as mercury has been linked to the development of this disorder. b. genetic factors appear to play a prominent role in the development of this disorder. c. it is characterized by a pervasive pattern of inattention and/or hyperactive and impulsive behavior. d. this disorder involves feeling overwhelmed and sad for extended periods of time.

The correct option is: D. This disorder involves feeling overwhelmed and sad for extended periods of time

Explanation:

Autism spectrum disorder is a type of neurodevelopmental disorder, characterized by restricted and repetitive behavior, activities or interests; difficulty in paying attention, social interactions and hyperactivity.

The risk of autism spectrum disorder increases if one has a family history of autism. Exposure to environmental metal pollution like aluminium, lead, mercury may also induce autism spectrum disorders.

Therefore, the statement D. This disorder involves feeling overwhelmed and sad for extended periods of time, is incorrect about autism spectrum disorder.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.

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explanation: