The medications that are generally used to treat ADHD have proven to be helpful to ____ percent of ADHD patients

The difference between perceiving many fine distinctions between colors and being color blind begins at the _____ level

a) retinal b) visual cortex c) genetic d) phenotypical

The three smallest bones in the human body are in the _____ ear; together they are called the _____

a) outer; pinnas. b) inner; otoliths. c) middle; ossicles. d) middle; hammers.