This biome has frost-molded landscapes, extremely low temperatures, little precipitation, poor nutrients, and short growing seasons.
What is the Tundra?
100
Through this process certain bacteria able to use 'free' nitrogen in the air to make nitrogen compounds.
What is nitrogen fixation?
100
An organism that eats only vegetation.
What is an herbivore?
100
A proposal that needs to be tested.
What is a hypothesis?
200
Biotic factors.
What are the living parts of a habitat?
200
This biome covers about one fifth of the Earth's surface and occur where rainfall is less than 50 cm/year.
What is the desert biome?
200
Nitrogen is returned to the atmosphere by the activity of these organisms.
What are decomposers?
200
The study of where organisms live.
What is biogeography?
200
A set of directions.
What is a procedure?
300
The largest population that an area can support.
What is carrying capacity?
300
This biome is a forest of tall trees in a region of year-round warmth; they now cover less than 6% of the Earth's land surface.
What is a tropical rain forest?
300
This is the continual transfer of nitrogen from the nonliving part of the environment to the living part and back again.
What is the nitrogen cycle?
300
The three factors are physical barriers, competition, and climate.
What are limits of dispersal?
300
The parts of an experiment that remain the same.
What are constants?
400
A process by which characteristics that make an individual better suited to its environment become more common in a species.
What is natural selection?
400
This biome has four distinct seasons: spring, summer, autumn, and winter. In the autumn the leaves change color. During the winter months the trees lose their leaves.
What is the deciduous forest?
400
This is the percent of nitrogen in the air we breathe.
What is 78%?
400
Organisms that use the sun's energy to turn water and carbon dioxide into food.
What are producers?
400
A factor that can be varied or manipulated in an experiment.
What is an independent variable?
500
A symbiotic relationship between two organisms in which one species benefits and the other is neither helped nor harmed.
What is commensalism?
500
This biome's harsh winters and nutrient-poor soils are limiting factors. Some plants found here include ferns, lichens, and sphagnum moss.
What is the Taiga (aka Boreal forest)?
500
FUTURE SCIENCE!!!
This type of volcano is "sleeping" but scientists expect them to awaken some time in the future, maybe not for thousands of years.
What is a dormant volcano?
500
An organism carried by people into a new area.
What is an exotic species?
500
FUTURE SCIENCE!!!
A bowl-shaped area that may form at the top of a volcano.