Do you think matter can enter or escape in an open system or a closed system? Is the fishbowl an open system or a closed system? Explain your reasoning. In what wants is Earth a system? Do you think its an open or closed system? Explain your reasoning.

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons

What is one early technological advance that shaped culture? a the use of fire b the discovery of arable land c family units. d migration

Which event most likely explains renewed demand in a recovery period? consumers choose to save more and spend less. economic policy renews consumer confidence and demand. producers decrease prices to prompt demand and recovery. production decreases to prompt increased demand.