21. Natural selection results in change overtime by acting on traits that are _________? *       a. heritable.       b. new.       c. mutated.       d. better. 22. Evolution is often described as "the theme that ties together all aspects of biology." This is because the process of evolution ________________________. *       a. explains how organisms become adapted to their environment.       b. explains the diversity of organisms.       c. explains why distantly related organisms sometimes resemble one another.       d. all of the above are appropriate answers.

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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.