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According to the serial endosymbiotic theory, chloroplasts evolved from:
Intracellular
Occurring within or inside a cell, affecting the cell's internal environment or processes.
Neurotransmitters
Chemicals that transmit signals across a synapse from one neuron to another in the nervous system.
Synapse
The junction between two neurons, where nerve impulses are transmitted from one to the other.
Sodium
A chemical element, symbol Na, that is a highly reactive metal and an essential mineral for living organisms.
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