you need to do a sterile technique.
commensals
Anaerobic
Salt may be considered an antiseptic because can kill microorganisms absorbing water from the environment.
With a degree in biology, yes you can become a microbiologist. At any four-year institution with a good biology department you have an option to specialize in microbiology or molecular biology. Without a Master's degree though your career options will be very limited. Most research microbiologists hold a Master's or PhD.
improperly managed sewage
Salt absorb water and without water microorganisms are killed.
No, without an improbable contamination.
Without microorganisms, we would die very quickly. For every 1 "human" cell in your body, there are about 10 "other" microorganisms in and on your body. Every aspect of life revolves around microorganisms, such as bacteria and fungi, essential to every aspect of life. Without microorganisms, everything would cease to exist.
commensals
Crops contact or cross contamination is when you use the same cooking equipment, surface or utensils in something that it was not used for without cleaning it. Ex using a knife to cut chicken breasts and then using the same knife on cooked chicken.
Anaerobic
Salt may be considered an antiseptic because can kill microorganisms absorbing water from the environment.
Equipment is what food is cooked in or on. Without equipment, food cannot be cooked.
With a degree in biology, yes you can become a microbiologist. At any four-year institution with a good biology department you have an option to specialize in microbiology or molecular biology. Without a Master's degree though your career options will be very limited. Most research microbiologists hold a Master's or PhD.
By sitting out for a long time with or without being cooked or cross contamination
Contamination by chemicals Over farming without nutriment replacement
Microorganisms can reach your food for several different reasons. Some foods and drinks are made with microorganisms as an ingredient such as the bacteria used to make cheese. Other microorganisms can come from someone handling food without washing their hands or several other sources.