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| 6693921575 | Mutualism | Symbiotic relationship where both partners benefit | 0 | |
| 6693921576 | Commensalism | Symbiotic relationship where one partner benefits and the other is unaffected | 1 | |
| 6693921577 | Parasitism | Relationship in which one partner obtains nutrients at the expense of the host | 2 | |
| 6693921578 | Biome | Large distinct terrestrial region having similar climate, soil, plants and animals | 3 | |
| 6693921579 | Carrying capacity | The number of individuals that can be sustained in an area | 4 | |
| 6693921580 | R strategist | Reproduce early in life; many small unprotected offspring | 5 | |
| 6693921581 | K strategist | Reproduce late in life; few offspring; care for offspring | 6 | |
| 6693921582 | Positive feedback | When a change in some condition triggered a response that intensifies the changing conditions (warm earth-more ocean evaporation-more stratus clouds-less sunlight) | 7 | |
| 6693921583 | Negative feedback | When a changing in some condition triggers a new response that counteracts the changed condition | 8 | |
| 6693921584 | Malthus | Said human population cannot continue to increase exponentially; consequences will be war; famine and disease | 9 | |
| 6693921585 | Doubling time | Rule of 70; 70 divided by the percent growth rate | 10 | |
| 6693921586 | Replacement level fertility | The number of children a couple must have to replace themselves | 11 | |
| 6693921587 | World population US populaitn | 6.7 billion 305 million | 12 | |
| 6693921588 | Preindustrial stage | High birth and death rates slow growth high IM | 13 | |
| 6693921589 | Transitional stage | Death rate lower; better health care; population grows fast | 14 | |
| 6693921590 | Industrial stage | Decline in birth rate; growth slows | 15 | |
| 6693921591 | Post industrial stage | Low birth and death rates | 16 | |
| 6693921592 | Age structure diagrams | Broad base=rapid growth Narrow base=negative growth Uniform shape=zero growth | 17 | |
| 6693921593 | 1st, 2nd & 3rd most populated countries | China, India, US | 18 | |
| 6693921594 | Most important thing affecting population growth | Low status of women | 19 | |
| 6693921595 | Ways to decrease birth rate | Family planning, contraception, economic rewards and penalties | 20 | |
| 6693921596 | Percent water on earth by type | 97.5% seawater 2.5% freshwater | 21 | |
| 6693921597 | Salinization of soil | In arid regions, water evaporates leaving salt behind | 22 | |
| 6693921598 | Ways to conserve water | Agriculture: drip/trickle irrigation Industry: recycling Home: use gray water,repair leaks, low flow fixtures | 23 | |
| 6693921599 | Point v. Non point sources | Point- from a specific location Non point- from over an area such as runoff | 24 | |
| 6693921600 | BOD | biological oxygen demand, Amt of dissolved oxygen needed by aerobic decomposes to break down organic materials | 25 | |
| 6693921601 | Eutrophication | Rapid algal growth caused by an excess of nitrates and phosphates in water | 26 | |
| 6693921602 | Hypoxia | BOD rises and DO drops and cannot support life | 27 | |
| 6693921603 | Minamata disease | Mental impairments cause by methylmercury poisoning | 28 | |
| 6693921604 | Primary air pollutants | Produced by humans and nature (CO, CO2, SOx, NOx, hydrocarbons, particulates) | 29 | |
| 6693921605 | Natural selection | Organisms that possess favorable adaptations pass them onto the next generation | 30 | |
| 6693921606 | Particulate matter | Source: burning fossil fuels and diesel exhaust Effect: reduces visibility and respiratory irritation Reduction: filtering, electrostatic precip, alt energy) | 31 | |
| 6693921607 | Nitrogen oxides | Source: auto exhaust Effect: acidification of lakes, respiratory irritation, leads to smog and ozone Reduction: catalytic converter | 32 | |
| 6693921608 | Sulfur oxides | Sources: coal burning Effects: acid deposition, respiratory irritation, damages plants Equation- SO2+O2=SO3+H2O= H2SO4 Reduction: scrubbers, burn low sulfur fuel | 33 | |
| 6693921609 | Carbon oxides | Source: auto exhaust, incomplete combustion Effects: CO binds to hemoglobin, reducing bloods ability to carry O2; CO2 contributes to global warming Reduction: catalytic converter, emission testing, oxygenated fuel, mass transit | 34 | |
| 6693921610 | Ozone | Formation: secondary pollutant Effects: respiratory irritant, plant damage Reduction: reduce NO and VOC emissions | 35 | |
| 6693921611 | Radon | Naturally occurring colorless, odorless, radioactive gas, found in some types of soil and rock, can seep into homes and buildings, formed from the decay of uranium, causes lung cancer | 36 | |
| 6693921612 | Photochemical smog | Formed by chemical reactions involving sunlight | 37 | |
| 6693921613 | Acid deposition | Caused by sulfuric and nitric acids resulting in lowered pH of surface waters | 38 |
