Create an account
a change in community composition over time that starts on areas where there is already soil (re: abandoned fields)
every ecosystem is characterized by two phenomena:
energy flows in one direction from the sun to producers and consumers, with a lot of it lost as heat; and chemicals cycle when inorganic nutrients pass from organisms to the atmosphere or soil
a large biogeographical unit of the biosphere that has a particular mix of plants and animals that are adapted to living under certain environmental conditions
teh distribution of biomes and thus the pattern of life on earth is determined principally by
the effect of temperature is seen not only when we consider ____ but also when we consider ____
the arctic tundra
encircles the earth just south of ice-covered seas in the northern hemisphere, covering 20% of the earth's land surface; cold, dark, layer of permafrost is present in the poorly drained soil
coniferous forests are found in these three locations:
taiga, near mountain tops, temperate rain forests
temperate deciduous forests are found
south of taiga in eastern north america, eastern asia, and much of europe
temperate deciduous forest climate
moderate with relatively high rainfall, well-defined seasons, large growing season
in the tropical rain forests near the equator, the weather is ____ and rainfall is ____
always warm, plentiful
shorter than trees with a woody persistent stem and no central trunk; thick evergreen leaves with a waxy protective coating
grasslands that contain some trees that occur where a relatively cool dry season followed by a hot, rainy one
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together