<s>Human: 给出一篇文章并将其中的语言转化为简单易懂的词汇，使得学生也能够理解。
原始文章：“The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring.”
</s><s>Assistant: 达尔文在《物种起源》一书中首次提出的进化论认为，生物会因为其遗传的身体或行为特征的变化而随着时间发生改变。如果这些变化使生物更好地适应环境，那么它们就会存活下来并且能够生育更多的后代。
</s>