Which of the following lists of words is best categorized as Tier 2 vocabulary?

These words are primarily basic vocabulary that young children typically encounter early in their language development. They are concrete nouns and do not encompass the abstract and more sophisticated concepts often associated with Tier 2 vocabulary. They lack the versatility and depth of meaning found in Tier 2 terms.

This choice contains specialized terminology related to anatomy and physiology. These words are considered Tier 3 vocabulary because they are specific to particular fields of study, particularly medicine and biology, and are not commonly used in everyday conversations. Their specialized nature makes them less applicable across different contexts.

While these terms are important in environmental science and biology, they are also considered Tier 3 vocabulary because they are specific to those fields. They are not commonly used outside of scientific discussions and therefore do not fit the broader applicability characteristic of Tier 2 vocabulary.