There are many latchkey children in the United States. In fact, according to the US Census, what percent of all children between the ages of 6 and 14 routinely spend
time alone in the home without adult supervision?
5
10
15
20

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Me d: which system contains the heart, blood, and blood vessels? a. muscular b. circulatory c. respiratory d. digestive which system contains the pituitary, adrenal, and thyroid glands? a. respiratory b. circulatory c. endocrine d. reproductive

True or false. repeated drug use may lead to drug tolerance which occurs when a user requires larger amounts of the drug to achieve the desired effect.