1.Chance collisions between atoms build up macromolecules that could repeat themselves.( build up不能忽略)
2.What we do know is that by three and a half billion years ago the highly complicated DNA molecules had appeared .(by换成about行么)
3.Each bit of information in scientific research can be thought of as the answer to a yes/no question.
4.The rate of increase of DNA complexity slowly rose to about one bit a year over the last few million years.
5.I’m not advocating human genetic engineering as a good thing .
6.In a way the human race needs to improve its mental and physical qualities if it is to deal with the more and more complex world around it and meet new challenges like space travel.( In a way 不能忽略)
7.The human race also needs to increase its complexity if biological systems are to keep ahead of electronic ones.