What was c? But I think its A.) a molecule that changes state.
Plant cells have a cell wall and cell membrane... Animal cells have a cell membrane but no cell wall
None. Please provide a picture
The widespread, large scale, worlddwide burning of enormous quantities of fossil fuels for their energy, such as coal, oil, and natural gas, could do that, if it ever began and became popular.
Oh, wait ! That"s what we've been doing, for a couple of centuries now !
