Which of the following is NOT a characteristic of omnivores?

Omnivores are organisms that have a varied diet, consuming both plant and animal matter. The correct answer indicates a characteristic that does not align with the definition of omnivores. Specifically, stating that omnivores "exclusively consume plants" is inaccurate because omnivores by definition cannot be restricted to just one type of food source; they must be able to consume both plants and animals to fit the classification.

The first choice correctly identifies one of the key attributes of omnivores, highlighting their dietary flexibility. The mention of omnivores as potential primary consumers—or low on the food chain since they feed on plants—and as capable of being secondary consumers, indicates their role in various trophic levels within an ecosystem. This variety underscores the complexity and adaptability of omnivorous diets, which is essential for their survival in different environments.