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