Threatening behavior by predators causes a porcupine to extend its quills.
Similarly, threatening or intimidating behaviors are also forbidden.
A porcupine will extend its quills when intimidated.
What defense mechanism does a porcupine use when intimidated?
Options:
A. eardrum
B. deadly
C. sound
D. instincts
E. steroids
F. organ
G. quills
H. blastoids