Where does the water in streams and rivers originate? a. precipitation b. runoff c. ice and snowpacks d. all of the above

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

What molecules does hemoglobin decay into over time

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?