A) These jellyfish have a centralized nerve net that controls rhythmic contraction of the feeding musculature.
B) Interconnected motor neurons are used for coordinated movement.
C) The rhopalia control coordinated bell muscle contraction via connections with a motor nerve net.
D) There is no need for coordinated movement in these filter feeders.

A) has neither coordinated intercellular control nor a biological clock.
B) has coordinated intercellular control but no measurable biological clock.
C) has no coordinated intercellular control but displays biological rhythms.
D) has coordinated intercellular control and displays biological rhythms.

A) The transmission rate is relatively slow.
B) Neurotransmitter release takes place throughout the body via the blood.
C) Neurons form highly discrete lines of communication.
D) In the PNS, a nerve consists of the axons of five or fewer neurons bundled together.