In the case of the chameleon, controlling for changing color if (and only if) a predator is present would be no more effective than simply changing color without first checking for the presence of a predator.
(controlling for changing color; would be; no more effective than simply changing color without first checking for the presence of a predator; L:In the case of the chameleon)
controlling for changing color
would be
no more effective than simply changing color without first checking for the presence of a predator L:In the case of the chameleon