1.
1/5 next century: scientists speculate that ___ of the current species may be gone within the __ ____
2.
5: there is evidence of _ major mass extinctions in Earth's history
3.
6th now: evidence suggests that the ___ mass extinction is occuring _-_
4.
20% 200: about ___ of species of birds have become extinct in the last ___ years
5.
25% 100: carbon dioxide levels have increased about _____ over the past ___ years
6.
2050 12.5: by____the human population is projected to be from 7.8-___billion
7.
abiotic factor: nonliving components of an ecosystem
8.
adapt or change: pressure exerted from one species on another forces those species to
9.
biology, chemistry, geology, economics, politics: many different disciplines are necessary to solve enviromental problems
10.
biosphere: the broadest most inclusive ecological level of organization
11.
biosphere: the thin volume of earth and the atmosphere that supports life
12.
biosphere: extends about 5-6 miles high to the deepest ocean trenches
13.
biosphere: most living things are found a few meters from the surface of the land or ocean
14.
biotic factor: living things in an ecosystem
15.
burning fossel fuels: carbon dioxide is formed by_____ ______ _____-
16.
carbon dioxide and water vapor: act as an insulating blanket over the earth
17.
carbon doxide: natural byproduct of respiration produced by all aerobic organisms
18.
CFCs o3 to 02: ozone is catalyzed by a reaction with ____ converting ___ __ ___ destroying its UV filtering effect
19.
CO2: increase in this has created greenhouse effect
20.
community: made up of only organisms
21.
community: these organisms are all of the living things within the ecosystem and interact with each other
22.
diminished to some degree: the ozone layer has _______ across the planet
23.
disturbances in ecosystems: if one population increases in number other populations may increase or decrease in response
24.
disturbances in ecosystems: second theme in biology
25.
disturbances in ecosystems: ecosystems may be disturbed by the impact of just one population
26.
ecosystems: all of the organisms and non-living components in a geographic location
27.
energy, food, waste disposal: creates increased demand for resources
28.
habitat destruction, overhunting, introduction of diseases, predation: pressures include
29.
increased declined: the human population has _____ others have _____
30.
interconnectedness: also called interdependent
31.
interconnectedness: all organisms interact with other organisms and the physcial enviroment
32.
interconnectedness: first theme in biology
33.
oil, coal and natural gas: fossil fuels
34.
organism: simplest level of organization in ecology
35.
population: all of the members of one species within the ecosystem at one time
36.
the tropics: extinction occurs most rapidly today in
37.
tripled 2 6: the human population has _____ since 1930 from _billion to _billion in 1999
38.
ultraviolent radation from the sun: what does the ozone layer protect inhabitants of the earth from _______________
39.
up 100: global temp. have gone __ over the past ___ years
