What is an example of a hidden treasure that could be found in layers of pleasse

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.

What is called the "building block" of life?

Dna is colied into chromosomes in a cell