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We need to study the details of a bacterium or virus
we can live without humidity but it will be hard to breath for us.
It is bacteria that can grow and reproduce without a live host
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Baccillus [plural. bacilli], Coccus [plural. cocci], and Spirillum [plural. spirilla] are three different shapes of bacteria [singular. bacterium]. A rod-shaped bacterium is called a baccillus. A spiral shaped bacterium is called a spirillum. Spirillum only live as single cells. A round bacterium is called a coccus. Some coccus form pairs and chains while others grow in grape like bunches. Some bacilli also form pairs or chains but they do not grow in bunches. Flagellum [plural. flagella] are hair like structures that allow the bacteria to move in liquids.
On average people can only live 1 month without food, do not try this because this is very dangerous and depends on your metabolism. Do Not Try This.
Live pathogens
Yes, some people depending on their metabolism can go four maybe five without food.
yes
It regulates metabolism. Plus it releasing hormones like TRH, which is needed for the thyroid to function
oxygen
You can live without it. The gallbladder stores bile produced by the liver until needed in the small intestine for fat metabolism.
Each organism is unicellular.But they may live in colonial form.
No human can live without a liver. The liver itself provides 500 functions, and is just as essential as the heart and brain. Without the liver one could not digest food. A few other functions the liver provides are storing vitamins and minerals, and regulating the body's metabolism!
Gram-positive bacterium, live on dead and decaying matter
Bacteria are all unicelular, but some live in colonies where they actually don't differ that much in cell size. 'Bacteria' is the plural form of 'bacterium'.
Possibly because reptiles have a slower metabolism, but there are many kinds of lizards with different dietary needs. Check to be sure, or you may lose your lizard.