1. which of the four major biogeochemical cycles are significantly affected by human activities?

water only
none of them
nitrogen and phosphorus only
carbon only
all of them (water, carbon, nitrogen, and phosphorus)
2. physical processes like evaporation and condensation are the main driving forces behind the cycle.

phosphorus
water
carbon
nitrogen
3. what is the source of energy that supports the growth of most producers?

calories in food (organic matter)
carbohydrates and lipids
heat
sunlight
4. which of the following are involved in biogeochemical cycles?

living producers
living consumers
decomposers and detritivores
land, air, and water
all of the above
5. turkey vultures soar high in the sky until they detect dead animals with their supremely sensitive noses. they then swoop down and eat the dead flesh. which of the following terms accurately describe turkey vultures? select all that apply.

producers
consumers
detritivores
decomposers
6. which human activity reduces transpiration and can reduce rainfall in the affected region?

fertilizer use
buring fossil fuels
deforestation
damming rivers