Natural selection: the biological process in which individuals better adapted to their environment tend to survive and reproduce, causing certain traits to become more common.
ダーウィンは自然淘汰によって種が変化すると説いた。
Darwin argued that species change through natural selection.
環境が変わると、自然淘汰の圧力も変化する。
When the environment changes, the pressures of natural selection also change.
人工選択と自然淘汰は進化の異なる要因だが、両方とも種の変化に関係する。
Artificial selection and natural selection are different factors of evolution, but both relate to changes in species.