This is a word related in origin, as certain words in genetically related languages descended from the same ancestral word. It is also the part of the word after all affixes have been removed.
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etymology

i will try let me see what they are first

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.  

he thought hans was leaving

at least thats what i think it is

sorry if wrong