Touching a jellyfish can be more painful than touching a comb jellyfish. Why is there a difference?
a. Ctenophores do not possess nematocysts.
b. Ctenophores have very reduced nematocysts that cannot penetrate human skin.
c. Ctenophores only use nematocycts for feeding, not for defense.
d. Nematocysts in ctenophores lack venom.