What factor limits the growth of populations of producers in the euphotic zone of the open sea?

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?

Which of the following biomes likely has the lowest concentrations of nutrients in its soils?

Use the following scenario to answer questions 24 – 27. 30 years ago, a ship sank off the coast of Argentina. A few rats escaped the sinking ship and swam to a remote island. The island was covered in ferns, and lizards spent their days sunbathing and consuming the ferns. When they arrived, the stranded rats began consuming the ferns as well, and their population grew. The diagram below depicts the size of the populations of the three species in the thirty years following the introduction of rats to the island. The interaction between the rats and the lizards would be considered…    

Which rivers are most likely to have both riffles and pools?

 Refer to the arctic food web diagram to answer the following question. If a major change in the environment were to severely decrease the size of the population of Killer Whales, what would most likely happen to the size of the population of Leopard Seals?

When the tundra melts in the summer, what types of plants become dominant?

Consider the environmental factors that change between the top and the bottom of a deep aquatic ecosystem. Typically, there are higher nutrient concentrations at the…

Consider the nitrogen cycle. When humans use the Haber-Bosch process to create synthetic fertilizer, where does the nitrogen come from?

Wetlands that are dominated by trees are called…