There are fewer predator than prey animals due to drastic reductions of _______ at each _______.

Ozone is a gas composed entirely of the element _______ that reaches its greatest density in the layer of the atmosphere known as the _______ and that has the effect of keeping _______ from reaching Earth’s surface.

Most of the energetic short-wave radiation from the sun is transformed into _______, which can be trapped by greenhouse gases such as _______ and ________.

Global warming is certain to produce a _____ in global sea levels and a(n) _______ in precipitation in the United States.

The warm surface air of the tropics _______ as it rises, causing it to _______ moisture. At about 30° N and 30° S of the tropics, however, air descends and _______ moisture from the land.

Earth’s large vegetation regions are essentially defined by _______.

Starting at the North Pole and going south, list the order in which you would be likely to find the following biomes: temperate deciduous forest, tundra, tropical rainforest, taiga.

With increasing distance from the shoreline toward open sea, the abundance of marine life _______. With increasing distance from the ocean’s surface toward the ocean floor, the abundance of marine life _______.

The tiny organisms collectively called _______ lie at the base of most marine food webs, thanks to their ability to _______.

An estuary is an area where a stream or river _______.

In the movie The Godfather, Michael Corleone and Enzo the baker stand on the steps outside the hospital where Michael’s father is recovering from gunshot wounds and pretend to be holding guns inside their coats as a means of keeping assassins from entering the hospital and killing Michael’s father. Allowing for some differences between the natural world and human society, what form of mimicry were Michael Corleone and Enzo the baker practicing?