male and female gibbon that are similar in size likely demonstrate the lack of sexual dimorphism… A : due to the polygamous social structure in gibbons. B : as the result of unequal access to resources within their environment.

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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.