Fact 1: Most invertebrates have a nervous system. Fact 2: Jellyfish and insects are invertebrates. Given the two facts above, what have a nervous system?

(a). fur seals;
(b). viruses;
(c). animals;
(d). jellyfish;
(e). bacteria;
(f). ducks;
(g). mammals;
(h). phytoplankton;
Answer:
(d).