question: Which two groups of invertebrates have complex brains ?
answer: arthropods ( insects , crustaceans , arachnids , and others ) , and cephalopods
turker_answer: Arthropods ( insects , crustaceans , arachnids , and others ) , and cephalopods are the two groups of invertebrates that have complex brains .
rule-based: Arthropods ( insects , crustaceans , arachnids , and others ) , and cephalopods have complex brains .