Which of the following is an example of a prohibited item?

The identification of plants and seeds as a prohibited item stems from various regulations that govern the movement and handling of materials to prevent the spread of pests, diseases, and invasive species that can harm the environment and agriculture. In many jurisdictions, specific plants and seeds are restricted to protect local ecosystems and agriculture. For example, certain seeds may harbor pests or diseases that could damage local crops, while some plants might be considered invasive species that threaten native flora.

In contrast, cultural artifacts, medications, and alcohol are generally subject to specific regulations but not universally regarded as prohibited items across the board. Cultural artifacts may have restrictions related to ownership and trade but are not inherently prohibited. Medications can often be carried under certain conditions, especially with prescription documentation. Alcohol typically has regulatory controls that may limit quantity or require permits, but it's not categorized as a prohibited item in most contexts. Therefore, the classification of plants and seeds as prohibited aligns with the need for environmental protection and biosecurity.