A) what two processes account for adding free oxygen to the precambrian atmosphere? b) what do we mean by free oxygen, and c) which of these two processes were most important?

Why is the price of rice so important? a. rice prices must be kept within reach of the poorest peopleb. rice prices must make a large profit or no one will grow itc. rice prices impact the cost of fruits and vegetables on neighboring farmsb. rice prices have no real importance other than to large corporations

In which area will soil formation be greatest? a a steep slope in a warm, b wet climate a flat area in a warm, c wet climate a north-facing area on a steep slope a flat area in a cold, d wet climate description

Because its government strictly controls its economy, north korea has a economy. a. command b. mixed c. traditional d. free market