The recovery process is used to a. replace cfc-12 with hfc-134a refrigerant. b. re-clean refrigerant for reuse. c. remove refrigerant from an ac system. d. aid technicians who have inhaled refrigerant.

Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis.b. the primary role of microbes on the planet involves causing disease in animals and humans.c. microbes produce vitamins in the intestines.d. microbes play a role in breaking down waste and decomposing dead organisms.

When water freezes, it . contracts expands

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?