<span>"they form a cyst: a hard covering is formed around the protozoan and metabolic rate is slowed"</span>
It was the famous Theodor Escherich who is a famous German bacteriologist that discovered the E. coli and was also known for his research in the area of protein synthesis. In addition to that, Theodor Escherich discovered the bacteria type when he examined its samples from a patient suffering from gastroenteritis.
Answer:
theyed eventually become extinct because they are unable to reproduce
