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DanishPastry
The neurons are connected, with a tiny gap between them called the synapse, by dendrites. Neurotransmitters are chemical compounds that carry signals across the synapse.
Uraniumdavid

Answer:

synapses

The chemical that helps them to communicate is neurotransmitters

Explanation: synapses have a receiving end and a sending end that helps them receive signal transmitted through the neurotransmitters