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Consider the nitrogen cycle. Denitrification is carried out by which group of organisms?

Which aquatic life zone in the ocean contains the most biodiversity?

Refer to the arctic food web diagram to answer the following question. Which term best describes the position of the herbivorous zooplankton in the trophic structure?

Refer to the arctic food web diagram to answer the following question. Which term best describes the position of the phytoplankton in the trophic structure?

Which industrial fishing technique can add significant amount of nutrient pollution to coastal ecosystems?

Which waste management technique most closely resembles natural systems?

Refer to the arctic food web diagram to answer the following question. If the size of the population of Leopard Seals increased dramatically, what would most likely happen to the size of the population of Emperor Penguins?

Which of the Earth’s features is responsible for the season’s experienced in temperate and polar regions?

Which of the following elements does not naturally cycle through the atmosphere?

Consider the hydrologic cycle. When the rate of precipitation is greater than the rate of infiltration, the result will be greater amounts of __________.