Last night, jason introduced me to a friend of his. whose hair was all the way down to the back of his knees in a single dreadlock. is this sentence correct

Incorrect sentence.

Corrected sentence: Last night, Jason introduced me to a friend of his, whose hair went all the way down to the back of his knees in a single dreadlock.

The period before the word "whose" in the original creates a fragment "Whose hair was all the way down to..." This is a phrase which is describing "a friend of his" and should be included in the same sentence. So you simply separate it by a period. 

the correct answer is the following.

one of the groups i belong to is the boy scouts. this is a problem-solving group because it has tasks that we need to solve in order to other people in different activities such as the rescue of lost pets, or elder people in need.

the other group i belong to is kids pro environment, and is an information-sharing group that tries to create conscience about the risks and problems that generate pollution in our cities. we share information to other students and parents on the importance of keep our communities clean and our skies clear.  

sugar had three basic uses in ancient india. it was used in religious rites, consumed as a snack, and was considered a kind of medicine.

verify this answer it would really me you so muchh