Thick fur can be used for keeping warm.
Carpet beetle larvae feed on the keratin and chitin commonly found in wool, fur, or feathers.
Keratin can be used for keeping warm.
What can be used for keeping warm?
Options:
(a) keratin
(b) vacuum
(c) four limbs
(d) energy
(e) cold
(f) engines
(g) magic
(h) heat