Examlex
External fertilization occurs in all of the following groups EXCEPT:
Endorphins
Natural chemicals produced by the body that help to relieve pain and stress.
Dopamines
A type of neurotransmitter that plays a significant role in the brain's reward system and motor functions.
Acetylcholines
Naturally occurring neurotransmitters in the body that play a key role in transmitting nerve impulses across synapses.
Somatic Nervous System
A part of the peripheral nervous system that controls voluntary movements of the body.
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