The term that draws a line between the predators and prey in an ecosystem is known as the trophic level. Trophic levels categorize organisms based on their food sources and energy flow within an ecosystem. Producers, like plants, form the base level, while herbivores (primary consumers) and predators (secondary and tertiary consumers) occupy higher levels. The interactions between these levels dictate population dynamics and overall ecosystem health, establishing the balance of energy transfer and survival among species.