生物学对动物是怎么从一个受精卵发展一个完全成形的有机体有一个相当好的理解。

Biology has a pretty good understanding of how animals develop from a fertilized egg to a fully formed organism.

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由于如今的英国，捐精或捐卵人工繁育的后代在年满18岁后可以查询到自己的生物学父母，很多潜在捐精者对捐精踌躇不前。

Because children born from donor sperm or eggs in the UK can now trace their biological parents when they turn 18, potential donors have been deterred, it is claimed.

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行为遗传学告诉我们即使在个人的范围上很多生活中的结果都似乎是路径依赖性的，或者仅仅是无法预测的，即使是同卵双生的人。

Behavior genetics tells us that even on the scale of individuals a great deal of life outcomes seem path dependent, or simply unpredictable, even for identical twins.

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