____ is carried by an insect and isa major killer of infants, responsible for about 1 million infant deaths per year, mainly in Africa

The three major stratification categories that can limit choice at every stage of life are age, socioeconomic status, and ethnicity

Indicate whether this statement is true or false.

Which of the following has been found to have a negative effect on our olfactory system?

a. Drinking caffeinated beverages b. Alzheimer's disease c. Gum disease and tooth decay d. Overexposure to loud noises