A team from a foreign university studied 102 different kinds of venomous snakes, investigated their venom, food and habitat, and found that snakes living in a three-dimensional environment such as trees or water are less toxic than snakes in a two-dimensional environment (that is, ground). The researchers speculate that this is because snakes living in a three-dimensional environment encounter more things, encounter prey more frequently, and do not need highly toxic venom to ensure that each hunt is successful.
If true, the statement that animals in a three-dimensional environment are more flexible and more difficult to capture than those in a two-dimensional environment is the most likely to question the researchers' conjecture.