The majority of young, inexperienced western garter snakes born in the laboratory from mothers captured in coastal areas of california readily eat pieces of slug. what are plausible proximate explanations for this behavior

I believe the answer is:

Coastal snakes can detect odor molecules produced by banana slugs.

Coastal snakes have a genetically acquired taste for banana slugs.

Since there is no indication of external treatment that being done to the snakes, this behaviour could only be explained by genetical factors. So, it would be either the snakes have a physical structure that can detect the slugs, or it has a cetain hormonal composition that make it attracted to the taste of banana slugs.

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and when black people use it, they know that's just how they greet each other

and when white folks use it, they know there's a double meaning under