Describe how CARBON moves between the four spheres (biosphere, atmosphere, hydrosphere, and geosphere) specifically in the various forms of fossil fuels. HELP PLZ TIMED

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f

What are similarities and differences of reflection, refraction, diffraction and absorption?