Hibernation is used for conserving energy by some animals.
Energy conservation is an important survival trait.
Hibernation is used as an important survival trait by some animals.
What is used as an important survival trait by some animals?
Options:
(a) bleeding
(b) lying
(c) hormones
(d) food and shelter
(e) hibernation
(f) four limbs
(g) proteins
(h) crying