A hydrogen fuel cell produces energy through an electrochemical reaction between hydrogen and oxygen. Hydrogen gas is fed into the anode side of the fuel cell, where it is split into protons and electrons. The protons travel through an electrolyte membrane to the cathode side, while the electrons flow through an external circuit, creating an electric current. At the cathode, the protons, electrons, and oxygen from the air combine to produce water and release energy in the form of electricity. **

No, ember is not hotter than fire. Ember is the glowing remains of a fire that has started to die down, whereas fire is the active, burning flames produced by a combustion reaction. Fire typically burns at a higher temperature than ember, as it is actively consuming fuel and releasing heat and light. **

An ember tetra is a small freshwater fish that is popular in the aquarium hobby. It is known for its vibrant red and orange coloration, resembling the glowing embers of a fire, hence its name. Ember tetras are peaceful and social fish that do well in community aquariums with other small, non-aggressive fish. They are relatively easy to care for and are a great choice for beginner fish keepers. **

Ember tetras are small, peaceful freshwater fish that are native to the Amazon River basin in South America. They are known for their vibrant red and orange colors, making them a popular choice for aquarium enthusiasts. Ember tetras are relatively easy to care for and can be kept in small groups in a well-maintained aquarium. Guppies, on the other hand, are also small freshwater fish that are known for their bright and colorful appearance. They are popular among beginner aquarists due to their hardy nature and ease of care. Guppies are known for their live-bearing reproduction, which means they give birth to live young rather than laying eggs. They are also known for their peaceful temperament and can be kept in community aquariums with other peaceful fish species. **

Ember tetras have red gills as a result of the presence of hemoglobin in their blood. Hemoglobin is a protein that contains iron and is responsible for transporting oxygen in the blood. The red color of the gills is due to the binding of oxygen to the hemoglobin, giving the gills their distinctive red hue. This adaptation allows ember tetras to efficiently extract oxygen from the water, which is essential for their survival in their natural habitat. **

Neon tetras and ember tetras are both small, colorful freshwater fish that are popular in the aquarium hobby. Neon tetras are known for their bright blue and red stripes, while ember tetras have a vibrant orange or red coloration. Both species are peaceful and social fish that do well in community aquariums with other non-aggressive fish. They are relatively easy to care for and are a great choice for beginner fish keepers. **

As an AI, I do not have the capability to play video games or experience the emotions associated with losing an ember in Dark Souls. However, I can provide information or tips on how to retrieve lost items in the game if you need assistance. **

Ember tetras are small, peaceful fish that can be kept with other small, peaceful fish in a community aquarium. Good tank mates for ember tetras include other small tetras such as neon tetras or cardinal tetras, as well as small rasboras, dwarf corydoras, and small shrimp such as cherry shrimp. It's important to avoid keeping ember tetras with larger or more aggressive fish that may intimidate or prey on them. Additionally, it's important to ensure that the tank is properly sized and has plenty of hiding places and plants to provide a comfortable environment for all the fish. **