Answer:
There is no factual basis to the claim that praying mantises cannot be killed. Praying mantises, like any other living organism, can be killed through various means such as physical force, chemicals, or environmental factors. It is possible that this idea may have originated from the praying mantis's reputation for being a formidable predator and its ability to defend itself against threats. However, this does not mean that the praying mantis is invincible or immune to death.