What was the FIRST organism to have what we consider a true central nervous system?

It has been found that humans:

a. are sensitive to almost the entire range of electromagnetic energy. b. can hear sounds that are two octaves beyond the range of bats. c. are one of the few species that can see ultraviolet light. d. can see a candle flame on a clear, dark night from 30 miles away.

Which of the following is the basic personality trait characterized by assertiveness, open expression of impulses, and confident assurance?

a. Conscientiousness b. Dominance c. Extraversion d. Confidence