Front

Pioneer species break down rocks, beginning the formation of _____________________.

Back

soil

Front

The _________________ of organisms help them survive changes to an ecosystem.

Back

adaptations

Front

A forest fire is followed by _____________ succession.

Back

secondary

Front

The series of changes that occur in an area where no soil or organisms exist is called _______________ succession.

Back

primary

Front

Which of the following is an abiotic resource? decomposer, tree, oil, water

Back

water

Front

Which of the following is a biotic resource? decomposers, water, sunlight, oxygen

Back

decomposers

Front

Which of the following is not an environmental effect of clear-cutting forests? stripping rock and soil off mountaintops, releasing large amounts of carbon dioxide into the air, destroying the habitats of organisms

Back

allowing nonnative species to increase

Front

Which of the following contributes to global warming? too much nitrogen, too much oxygen, too much carbon dioxide, too many herbicides

Back

too much carbon dioxide