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Many snakes living in the sea and on land are incredibly venomous. If they [bit|bite|have bitten|had bitten], the consequences are fatal.
If the venomous creatures [did not possess|has not possessed|have not possessed|possessed] venom, they would be unable to overpower prey without risking their own neck. The production of venom takes a lot of energy but if it[made sense|has made sense|would have made sense|made no sense], this ability would have vanished thousands of years ago.
If the danger of venom [was linked|had linked|were linked|had been linked] to the size of the creature, we [could predict|can predict|could have predicted|could be predicting] the scale of danger but this is not the case. If a scorpion [was big|is big|were big|has been big] and scary-looking, it [did not mean|were not meant|would not mean| does not mean] that it is not the most dangerous. Instead, it is the smallest bug that we had better avoid. The truth is that if a predator is small, weak and slow, it [does not need|needs|will need|will not need] more powerful venom to kill instantly avoiding the struggle. Natural laws are wise.