求分析这个长难句，句子成分、语法结构之类的，越详细越好，明早英语课个人展示要用，急！

Question

What Dr Cole seems to have revealed, then, is a mechanism by which the environment (in this case the social environment) reaches inside a person's body and tweaks its genome so that it responds appropriately.
科尔博士揭示的似乎是这样一种机制：环境深入人体并刺激人的染色体组，促使染色体组做出恰当的回应。

Answer 1

What Dr Cole seems to have revealed, 【is】then a
mechanism by which the environment (in this case the social environment)
reaches inside a person's body and tweaks its genome so that it
responds appropriately.
这句子缺谓语，then前面应该有一个谓语动词is；

主句结构
What Dr Cole seems to have revealed主语【主语从句】；
谓语is；表语a
mechanism；
后面二个定语从句修饰先行词a
mechanism。
语义
Dr Cole当时似乎揭示了一种机制，通过这种机制，外部社会环境对人产生刺激，而人体对刺激能够通过基因【染色体组】的变化对之做出相应的反应。追问

谢谢，请问后面的两个定语从句是哪两个？

追答

by which--and--

Answer 2

cAdversity successfully overcome is the highest glory.追问

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