as is shown의 주어와 형용사 순서가 궁금해요

1. “The whole atmosphere of the world in which we live is tinged by science, as is shown most immediately and strikingly by our modern conveniences and material resources.”에서 as is shown의 주어가 뭔가요?
주어가 science인지 궁금해요. as가 관계대명사도 아닌데 주어가 생략된 건가요?
2. “This conviction is the most important single gift of science to civilization.”에서 important와 single처럼 형용사가 연달아 나올 수 있나요?

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