Available options:
[1]. engines
[2]. forces
[3]. keratin
[4]. Glass
[5]. muscles
[6]. fur
[7]. oil
[8]. sweat
Q: Fact 1: Athermal insulator slows the transfer of heat. Fact 2: Materials like glass and wood are electrical insulators and thermal insulators. Given the two facts above, what can slow the transfer of heat?
A:
[4].