What do scientists use to simulate conditions in the natural world

Disinfection of impression materials is usually accomplished by a. sterilization with high heat. b. spray or immersion in a chemical disinfectant. c. sterilization with steam under pressure. d. allowing the impression to sit 24 hours in water until all the organisms die.

Secondary succession would most likely be taking place in a(n)

20 the compound al(nh3)2 has atoms of nitrogen.