system
Given the following post, respond as if you're commenting on Reddit:
human
How is knowledge and instinct passed down genetically in species that don't acculturate their young?

For example, reptiles that hatch and immediately are on their own, or how spiders know how to build webs and where to build them.
gpt
They don't really get "passed down" so much as it is "embedded" in the genetic code. Through millions of years of evolution, the best fit (most aggressive croc or best placed web) has been kept going so long that it is to them as curiosity is for a human baby. Whether or not there are parents, babies will put things in their mouth and probably learn to walk; similarly, aggressiveness or web-placement is the "instinctual" habit of the unique species.