The official government racial and ethnic categories on the census have changed with almost every census throughout american history. which of the following is the only category to have been consistently named on the census throughout u. s. history?

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

Advertisements are filled with images of extremely fit and sometimes even underweight people. what is an example of how these images might positively influence a person’s health choices? a) choosing to use weight loss supplements to increase weight loss b) electing to skip meals to reduce calorie intake until target weight is met c) figuring out ways to purge after meals to reduce the number of calories consumed d) finding ways to increase physical activity to burn calories and increase heart weight

Which of the following is not a possible cause of conduction deafness? a) cochlear nerve degeneration b) middle ear infection c) impacted cerumen d) otosclerosis