A bacterium that relies solely on fermentation for energy generation uses glycolysis exclusively.
1. Functions related to temperature regulation, endocrine functions, metabolic processes, and thirst are linked to the hypothalamus. The correct answer from the provided selections is option three. 2. The example of "Heart beating" is identified as a function that is solely performed by the autonomic nervous system, with the correct answer being the second option. 3. When potassium diffuses from a neuron, it leads to depolarization. The correct answer among the given options is the second one.