eli5 what is it that makes a snake more venomous then another?

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today I came across a video with a title along the lines of ‘second most venomous snake, only after then inland tipan’ and I’m wondering what makes something more venomous then another?

Is it how quickly it makes the blood clot/ affect the blood? Is it how rare the meds are to fix it or how quickly you have to seek medical treatment? As I type this post I’m thinking maybe it is how deadly the venom is. Anybody know?

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