Will a real gas ever reach absolute zero? why or why not?

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled