The Manual Autoclave is primarily used by veterinarians or surgeons, but is also used in a range of other settings, including active surgery center, medical practice, dental office, schools, industrial lab, doctor's clinic, or tattoo establishment. Tuttnauer M Series Manual Autoclave Features: Reliable and durable.
Vote for this answer. It is estimated that the first life forms on earth were primitive, one-celled creatures that appeared about 3 billion years ago. That's pretty much all there was for about the next two billion years. Then suddenly those single celled organisms began to evolve into multicellular organisms.
The age of the Earth is about 4.54 billion years; the earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago, and possibly as early as the Eoarchean Era, after a geological crust started to solidify following the earlier molten Hadean Eon.