Answer: They make energy for the cell, the "powerhouse" of the cell. In plant cells, the mitochondria use sunlight, carbon dioxide, and water, in animals, it uses the food we eat (glucose), oxygen, and water to make energy, also known as ATP.
Elpenor was one of Odysseus' comrades, and happened to be the youngest. This was labelled as part of the road of trials for that fact he had to mourn about this, thinking this was his fault. He had to overcome this.
