Cycles are essential to all living organisms.
Which of the following statements about positive feedback mechanisms is not true?a.Positive feedback mechanisms can result from human activity.b.Positive feedback mechanisms can occur naturally.c.Positive feedback mechanisms lead to increased change.d.Positive feedback mechanisms reduce change in a system.
Which of the following statements is true? a. The nitrogen cycle is the most important cycle for life. b. The oxygen cycle is the least important cycle for life. c. Life can be sustained without any of the cycles for life present. d. All cycles of matter are equally important for life to be sustained. Please select the best answer from the choices provided
The biosphere is the only one of Earth’s systems that contains life.
Which of the following is not a way in which carbon gases are introduced into the atmosphere? a. forest fires b. respiration c. photosynthesis d. burning of fossil fuels Please select the best answer from the choices provided
How are the carbon, nitrogen, and oxygen cycles similar?a.They are all biogeochemical cycles.b.They all involve an interaction between living and nonliving elements.c.They are all part of the Earth system.d.All of the above.
Nitrogen-fixing bacteria convert atmospheric nitrogen into forms of nitrogen that living things can use. Please select the best answer from the choices provided
Which of the following is a possible source of water pollution? a. storms b. factories c. farms d. all of the above Please select the best answer from the choices provided
What is the main advantage to using satellites to measure climate change?a.They can measure aspects of climate globally.b.They are unaffected by the weather conditions they measure.c.They are a universal tool for measuring all factors of climate.d.They can measure the amount of rainfall a specific area receives.
The majority of water on the Earth is usable by plants and animals.
Which of the following does not take place in the water cycle? a. precipitation b. evaporation c. carbonation d. condensation
Plants in the rainforest contribute to precipitation there through transpiration.
Ice does not need to melt into liquid water before it can return to the atmosphere as water vapor.
Water stored in snow and ice can return directly to the atmosphere through the process of sublimation. Please select the best answer from the choices provided
Compare nonpoint source pollution to point source pollution.
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Unit Test
Effects of Cycles on Ecosystems