For pure World Boxing Organization (WBO) tournaments, boxers are typically required to have up-to-date vaccinations for diseases such as hepatitis B, hepatitis A, tetanus, and influenza. These vaccinations are important to ensure the health and safety of the boxers, as well as to prevent the spread of contagious diseases in a tournament setting. Additionally, some tournaments may also require proof of vaccination for other diseases depending on the location and regulations of the event. **

A pure streaming PC typically only needs one graphics card. The main focus of a streaming PC is to efficiently encode and broadcast video content, which can be done effectively with a single graphics card. Additional graphics cards may be unnecessary and could potentially introduce complications or compatibility issues. It is more important to prioritize a high-quality, reliable graphics card rather than having multiple cards for streaming purposes. **

Both pure Germans and pure Celts can have a range of hair colors, including blond and red. While the stereotype of Germans being blond-haired and blue-eyed is common, it is not accurate to say that all pure Germans have these features. Similarly, while red hair is often associated with Celtic heritage, not all pure Celts have red hair. Hair color is determined by a complex combination of genetic factors, and can vary widely within any ethnic group. **

A mixture is a combination of two or more substances that are not chemically bonded together and can be separated by physical means, such as filtration or distillation. A pure substance, on the other hand, is a substance that is made up of only one type of atom or molecule and cannot be separated by physical means. Examples of mixtures include saltwater and air, while examples of pure substances include elements like gold and compounds like water. **

Pure metals are metallic elements that are composed of only one type of atom. They have a simple atomic structure with atoms arranged in a regular pattern, allowing for high electrical and thermal conductivity. Pure metals are typically soft and malleable, making them easy to shape and form into various products. Examples of pure metals include gold, silver, and copper. **

Yes, pure hydrogen is flammable. It is a highly flammable gas that can ignite and burn in the presence of oxygen. **

Pure oxygen is oxygen that is not mixed with any other gases or impurities. It is a highly reactive gas that is colorless, odorless, and tasteless. Pure oxygen is often used in medical settings, scuba diving, and various industrial applications. **

No, Attack on Titan (AOT) is not purely about death. While death is a significant theme in the series due to the constant threat of Titans and the brutal nature of the world, the story also explores themes of hope, survival, friendship, and the resilience of the human spirit. The characters in AOT face numerous challenges and hardships, but they also demonstrate courage, determination, and the will to fight for a better future. The series offers a complex and multifaceted portrayal of the human experience, going beyond just the concept of death. **