Final answer:
The level of response for the formation of blisters from sunburn is superficial, as it involves damage to the epidermis where the separation of layers leads to fluid accumulation within the vesicle.
Step-by-step explanation:
The level of response for vesicles, or blisters, due to an individual spending too much time sunbathing is typically superficial. Blisters form when there is damage to the skin that leads to a separation of the epidermal layers and the collection of fluid between them. In the context of sunburns, the damage is usually limited to the epidermis, which is the outermost layer of skin. The formation of blisters indicates that the skin has sustained enough damage to disrupt the connections between cells, leading to fluid accumulation within the vesicle.