Basically, if even if there are adaptations that could happen to make an animal more resistant to venom, the incremental changes in their circulatory system required to do this are so maladaptive/harmful that they can’t happen.
This is a pretty core part of competitive strategy: matching enduring strengths against the enduring weaknesses of competitors.
That said, races can shift dimensions too. Even though snake venom won the race against blood, gradual changes in the lethality of venom might still cause gradual adaptive changes in the behavior of some animals. A good criticism of competitive strategies between states, businesses, etc. is that the repeated shifts in competitive dimensions can still result in Molochian conditions/trading away utility for victory, which may have been preventable via regulation or agreement.
Basically, if even if there are adaptations that could happen to make an animal more resistant to venom, the incremental changes in their circulatory system required to do this are so maladaptive/harmful that they can’t happen.
This is a pretty core part of competitive strategy: matching enduring strengths against the enduring weaknesses of competitors.
That said, races can shift dimensions too. Even though snake venom won the race against blood, gradual changes in the lethality of venom might still cause gradual adaptive changes in the behavior of some animals. A good criticism of competitive strategies between states, businesses, etc. is that the repeated shifts in competitive dimensions can still result in Molochian conditions/trading away utility for victory, which may have been preventable via regulation or agreement.