Which physical properties of nylon and leather make them good choices for shoelaces?
flexibility and conductivity
hardness and durability
durability and flexibility
conductivity and hardness
The correct answer is durability and flexibility.
Nylon and leather are both known for their durability, which means they can withstand wear and tear over time without breaking or fraying easily. Furthermore, these materials are also flexible, allowing the shoelaces to be easily manipulated and tied in various ways without losing their shape or structure.