What distinguishes a left snail from a right snail based on their indicators?

The distinction between left snails and right snails primarily revolves around the presence or absence of perennial indicators. A left snail is characterized by a specific set of indicators that signify its perennial status, making choice C correct. This absence of perennial indicators in a left snail becomes a defining attribute for categorizing it as different from a right snail, which possesses these indicators.

Understanding this distinction is significant in identifying and classifying snail species based on their morphology and reproductive indicators. The left snail’s characteristics suggest adaptations that may differ from those of right snails, providing insight into their ecological roles and behaviors.