Octopuses and squid may not necessarily be smarter than other invertebrates because:
a. all invertebrates share the same basic nervous system
b. no invertebrate is more complex than any other
c. they are able to perform explorative and manipulative tasks that humans have deemed "intelligent"
d. it is impossible to give octopuses and squids problem-solving tests
e. they are more primitive than arthropods and echinoderms
Ans: c. they are able to perform explorative and manipulative tasks that humans have deemed "intelligent"
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