Connect the highlighted words “while” (l. 01), “however” and “whether” (l. 11) to the ideas they convey in the text, in order:

   ADHD stands for attention deficit hyperactivity disorder. It is a common disorder that often results in learning difficulties. People with this disorder act impulsively and are easily distracted. They may also exhibit hyperactive behavior. While some specialists consider ADHD a behavioral disorder, others call it a cognitive disorder.   The cause of ADHD is unknown. However, brain scans indicate that it may be caused by abnormal size, function, and form of the brain’s frontal lobe. There may also be an imbalance of chemicals in the brain. ADHD is believed to be inherited in most cases, but it is also prevalent in premature babies and children who have experienced head injuries.     The disorder ADD (attention deficit disorder) was renamed ADHD to account for the “hyperactivity” that i... Ver mais