The first law of thermodynamics and the law of conservation of matter are similar in that

Desert and tundra both

Phosphorus cycles through the Earth’s ecosystems

If you visited a savanna, you would likely see

The hydrologic  cycle is the movement of _____.

Environmental literacy does not refer to

Which quote and in-text citation follows MLA style?

Nearly half of the world’s population currently lives in cities.

A team of ecologists observed feeding patterns of several populations in the desert.  The energy pyramid shown below depicts the feeding patterns the ecologists observed.Which of the following best explains the difference in the amount of available energy in the trophic levels of the desert ecosystem?

Many American cities are rebuilding public transportation systems that were abandoned in the latter half of the twentieth century.