Which is biotic?
O water
O temperature
beeswax
rocks

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.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

What molecule does hemoglobin decay into over time