In many omnivorous species, it is difficult to know the correlation of individual fitness with the resource distribution of the food available. Would it be enough to measure relative fitnesses of individuals of an omnivorous species in order to know what mode of selection is acting on the omnivore population?  Why or why not

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Ecological adaptations

An ecological adaptation is any morphological, physiological, or behavioral trait of an organism that allows it to survive and reproduce in a habitat or ecosystem. Adaptation is a biological mechanism by which an organism gradually gets more acclimated to its surroundings.