Dr. O'Connor discovered a new species of sea slug. In this species, the axon terminals and the dendrites of the neurons communicate via direct contact. Unlike humans, this species does not have _____ between its neurons.

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In humans and many other species, neurons communicate at junctions called synapses, where the axon terminal of one neuron comes close to, but does not directly touch, a dendrite of another neuron. The description of direct contact for communication between neurons in the sea slug indicates the absence of synapses, which are the gaps across which neurotransmitters are released to carry signals from one neuron to another.

Dr O'Connor Discovered a New Species of Sea Slug