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Image source: TROP ICSU
To start, what is natural selection? Natural selection is, as written in the name, how nature selects which species get to survive off of their traits. Imagine if a grizzly bear were to live in the Arctic, it wouldn’t survive for long since its traits aren’t made for that climate. Brown fur gives away his position for hunting and his movements does not allow him to swim as well as polar bears do.
Natural selection isn’t limited to just environments. Hunting, escaping, and other survival needs are done through natural selection. It also doesn’t happen to just one animal. It is genetic meaning whole species are affected by it. Steven Rindner’s biggest example is the human species. Through certain genetic traits, our brains became the most advanced, allowing us to be where we are now.