Both "by" and "with" can be used in this context to show the relationship between science and technology and the changes in human life. "By" is often used to indicate the agent or cause of something, while "with" is used to indicate the means or method by which something is done. In this case, "by science and technology" suggests that science and technology are the driving forces behind the changes in human life, while "with science and technology" would suggest that science and technology are the tools or resources used to bring about those changes. Both are correct and can be used interchangeably in this context.