Final answer:
Low porosity hair has tightly bound cuticle layers that absorb minimal moisture, similar to plant cuticles that protect against water loss but restrict gas exchange, necessitating stomata for regulation.
Step-by-step explanation:
The porosity condition that describes hair that is able to absorb the least amount of moisture is referred to as low porosity. This characteristic is due to the tightness of the cuticle layers on the hair shaft, making it difficult for moisture to penetrate. Low porosity is analogous to plant cuticles, which are designed to prevent water loss. In plants, this waxy layer protects against desiccation but also limits the intake of carbon dioxide necessary for photosynthesis, leading to the evolution of stomata to regulate the exchange of gases and water vapor.