Question

which is a substance made up of durable fibers that resist heat and fire? ultraviolet light pesticides asbestos lead

Explanation:

Ultraviolet light is a form of radiation, not a fibrous substance. Pesticides are chemical compounds used to kill pests, with no heat/fire-resistant fiber structure. Lead is a heavy metal, not a fiber. Asbestos is a naturally occurring mineral composed of durable, heat and fire-resistant fibrous crystals.

Answer:

asbestos