Yeast, because without yeast we could not create mass quantities of bread for the masses and we couldn't make wine or cheese or other resources that are used in so many industries, it's also very useful in genetic modification due to it's simple nature you can modify it and add and edit Gene's like makin fb it glow in the dark or bioluminescent. Lastly, we can use its process to make biofuels for space travel and for a symbiotic relationship with other plants and animals.
Ali would be the correct one for this problem. Veterinary technicians are responsible or allowed in performing physical exams and talking to clients about their animals but they are not allowed to interpret results. Technicians are the ones to handle instruments and equipment while the veterinarians are the ones who can perform physical exams and the reading of the results.
1) Exercise it by singing and hitting different notes, however don't go overboard
2) Make sure you don't overuse your voice, as well as trying to rest your voice when you are sick
3) Overall, have healthy habits, like not smoking and drinking a sufficient amount of water.
