What happens when a neuron sends a signal?

It happens synapse

Explanation:

The neurons or nerve cells are electrically excitable cells that process and transmit information by electrochemical signaling. This information flowing from one to another neuron is called synapse and it consists of a presynaptic ending that contains neurotransmitters, mitochondria, and other cell organelles, a postsynaptic ending that contains receptor sites for neurotransmitters and finally a synaptic cleft or space between the presynaptic and postsynaptic endings.

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explanation:

essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.