PbO2(s) —— PbO(s) + O2(9)
balance this equation

Substance x has a fixed volume, and the attraction between its particles is strong .substance y had widely spread out particles and can be compressed what can most likely be concluded about these substances

Which part of a feedback mechanism is able to monitor the conditions outside of cells and usually uses nerve cells to relay this information to an intergrating center

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