Various words are used but 'environment' is a good catch-all. You may also consider ecosystem or habitat.
Their habitat
Lut desert
Habitat.
in it's habitat as they say in the textbook
An organism can live as long as it can live.
bacteria domain archaea
A parasite will live in anything that is larger than it. so... this means that it can live in anything from your dog to you. It can even live in you mom.
The place an organism fits into its habitat is its niche.
A place where organism spends his/her life is habitat.
to help an organism live you need nutrients, like any types of food, depending on the organism.
the two main things need to survive is raw materials and a place to live
some simple organism can survive without food and air but not water