밑줄 친 부분 문장 파악 좀 도와주세요
1. garden nurseries occupy alleyways, shops are built under staircases and metal structures cling to the side of buildings.
밑줄의 cling 왜 이런 형태로 나온건가요?2. a recent study found that the appendix serves as a safe house for good bacteria, which help people digest food and fight off bad bacteria.
which 의 선행사는 뭔가요? 뒤에 동사가 help 이렇게 복수동사로 나오는데 앞 문장은 단수명사들만 있네요 ㅠㅠ