Resources normally replaced/replenished by natural processes.

Alien species introduces by human agency into biological communities where they wouldn't naturally occur.

A description of the long-term pattern of weather in a particular area.

An organism that obtains energy and nutrients by feeding on other organisms or their remains.

The amount of land and ocean area needed to support one person is that person's ________________.

All of the water on or near Earth's surface is called the _______________.

The number and variety of species that live in an area is that area's ___________________.

Without the greenhouse effect, Earth's atmosphere would be ________ to support life.

The living and once living parts of an ecosystem, including all the plants and animals.

The nonliving parts of an ecosystem.

Copper ore, petroleum, and diamonds are all _________________ resources.

The introduction of harmful levels of chemicals or wastes into the environment is called ______________.

The place where an organism lives and that has the resources the organism needs is its ___________________.

A society achieves ______________ when people can maintain a higher standard of living without depleting available resources.

Nitrogen in the atmosphere is made usable by living organisms by ___________ bacteria.

The difference between a predator and a parasite is that a predator usually kills and _________ its prey, where as a parasite lives in or on a ___________.

Less-developed countries suffer more from rapid population growth because they are less likely to have the ____________ to support the population.

The density of a population is the number of individuals per unit _______.

The first step in surface coal mining is to remove and set aside the ______ that covers the area to be mined.

Heat islands affect local __________ patterns.

Traffic jams, substandard housing and polluted air and water can be caused by rapid growth in cities, a phenomenon known as ______ crisis.

Eliminating invasive plants and replacing them with native plants is one aspect of __________ improvement.

The designation of wilderness areas provides for ___________ habitats.

Most of Earth's fresh water is ___________ at the North and South Poles.

Many areas of the world without adequate fresh water become habitable because ___________ management projects have diverted water to the area.

The largest watershed in the United States is the _________ River

Most large cities get water for households and industries from _________ and rivers

Water ________ is an inexpensive solution to providing everyone with more fresh water to use.

Some communities have banned detergents containing high levels of ________________.

Most of the pollutants in the ocean come from activities on ______.

The effects of water pollution on ecosystems can magnify over time within _____ chains.

A common feature of ________ pollution and artificial eutrophication is that they both decrease the amount of oxygen dissolved in water.

Schools in the US have spent over $40 billion to remove __________.

Making products from recycled materials often saves _____ and other resources during the manufacturing process.

The main problem with so-called biodegradable plastic is that only its ______ portion actually decomposes.

If you visited a savanna, you would most likely see large herds of ___________ animals, such as rhinos, gazelles and giraffes.

Grasslands, such as the prairies of North America, are threatened by soil erosion because native grasses have been damaged or destroyed by plowing and ______________.

Animals that live in the desert are usually_____________.

The tundra has a layer of soil that is permanently _______ beneath the topsoil.

Taiga is a forest biome dominated by ____________ trees, such as pine, fir, and spruce.

______________ are very productive ecosystems because they receive fresh nutrients from rivers and oceans.

__________ are commonly found on flat, poorly drained land.

As they flow down a mountain to flatter ground, __________ generally become wider, slower and warmer.

Coral reefs are intricately shaped rocklike structures that are formed as a result of the secretion of ___________ by tiny marine animals.

In a nuclear power plant, three pipe circuits pump______ through the reactor, turbine and cooling tower.

_________ energy is energy from sources that are constantly being formed.

A hybrid car uses an efficient ________ engine and electric motor.

Compared to washing clothes in warm water, washing clothes in cold water uses much ______ energy.

In the US using public transportation and developing more _______ engines for vehicles would increase energy efficiency.

what part of the Earth encompasses all areas where organisms can obtain the energy they need?

Which kind of organism obtains energy only from producers?

Burning fossil fuels has the most effect on the balance of ________ in the atmosphere.

Nitrogen makes up ____________ of our atmosphere but can be used by plants only when transformed by bacteria first.

The main characteristics that all organisms that can create their own energy have in common is that they are_______.

___________ that live in roots of soybean plant play a critical part of the nitrogen cycle by changing nitrites into usable forms for plant to make amino acids.

Producers are likely to be in the bottom ________ level of a food chain.

What is the name of the diagram we use to illustrate the many feeding relationships that are possible in an ecosystem?

What is the symbiotic relationship when one species is helped but the other is neither helped nor harmed.

What is the symbiotic relationship between a Canadiam lynx and a snowshoe hare?

The relationship between African ants, who eat nectar produced by acacia trees, and the trees they protect from leaf eating insects and herbivores is an example of which of the symbiotic relationships?

_____________ is often spread through unsafe public water sources.

The number of organisms that a particular area can support at a given time.

Cutting only medium sized or mature trees is the most effective at allowing forests to recover from ___________________.

Where do most Americans live?

We add chlorine to water during the treatment process to kill _________

Parasitic worms are classified as what type of water pollutant?

Which of the following can be a way a person could conserve water?

Which of the following represents nonpoint source pollution?