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

Plants that can survive through winters and sustain themselves for more than one growing season are called…

In a tropical forest, most of the photosynthesis is occurring in the __________ layer.

To prevent the spread of invasive species, citizens should…

Which biome is the most biodiverse?

Which type of ecosystem would likely have the lowest net primary productivity?

Which of the following terms is best associated with a dry climate?

Carson River, Nevada, has been contaminated with mercury, and has been designated as a Superfund Site by the USEPA. Researchers have tested the water for methyl mercury and found concentrations as high as 0.0002 parts per million. Ecologists have been researching the local beaver population, who consume mostly shellfish and crayfish. When they analyzed fatty tissues from the beavers, they discovered concentrations of methyl mercury as high as 3 parts per million. Which of the following terms best describes this phenomenon?

Which type of inter-species interaction drives the development of taller plant communities during primary ecological succession in terrestrial ecosystems?

The atmosphere consists of mostly __________ gas.