问题描述：
请帮分析一下这个句子的结构成分,雅思水平
句子是这样的：This ,in essence ,is the problem of modern sociobiology —to discover the degree to which hard-wired genetic programming dictates,or at least strongly biases,the interaction of animals and humans with their environment,that is ,their behavior.
第一个破折号后面那个to的部分,在句子中做什么成分,还有,里面那个which指代的是什么.
句子是这样的：This ,in essence ,is the problem of modern sociobiology —to discover the degree to which hard-wired genetic programming dictates,or at least strongly biases,the interaction of animals and humans with their environment,that is ,their behavior.
第一个破折号后面那个to的部分,在句子中做什么成分,还有,里面那个which指代的是什么.
问题解答：
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