Oxygen was initially created in earth's atmosphere by
●volcanoes outgassing
●cyanobacteria photosynthesizing
●greenhouse effect
●ozone breaking down

Correct the sentence alice who lived next door goed to a different school

Which statement best completes the diagram of the ways the different branches of government can limit each other's powers?

Why are the majority of the world's economies mixed? what may happen to the "pure" types of economies (traditional, socialist/command, market capitalist) when they incorporate elements from other economic models?