How do children learn grammar without formal instruction?

How are the causes of the problems viewed? medical model public health model human services model. what is a method of treatment? medical model public health model human service modelj

Which of the following represents the results of a review of well-controlled studies of vitamin c supplementation on the resistance to, and recovery from, colds? there was a reduction in the duration of colds by 50% on the average. there was a slight effect on reducing the duration and severity of colds for people taking vitamin c supplements. there was a significant reduction in the duration of colds in people who consumed at least one gram a day. there was a significant reduction in the number of colds only in people who consumed > three grams per day.

Which resource is most likely to provide accurate information about staying healthy