| A | B |
|---|
| one difference between primary and secondary succession | secondary begins on soil, primary begins in lifeless areas |
| In 2000, the human population was | 6 billion |
| a density-independent factor is | fire |
| the following is least likely to be affected by a density-dependent factor | a small, scattered population |
| water lilies do not grow in desert because water in the desert is a | limiting factor |
| If population grows larger than the carrying capacity of the environment | the death rate may rise |
| NOT a limiting factor for seal population | drought |
| A condition of environment that can restrict a populations growth | limiting factor |
| ponds and lakes are | standing-water ecosystems |
| a population is defined by | geographic boundries |
| interaction in which one organism captures and feeds on another organism | predation |
| the following is NOT an abiotic factor | plant life |
| sybiotic relationship between flower and insect | mutualism (both benefit) |
| matter can be recycled thru atmosphere because | chemicals can be used again and again |
| algae at the beginning of the food chain are | producers |
| organisms that obtain nutrients by breaking down wastes | decomposers |
| the interconected feediing relationships in an ecosystem | food web |
| bird stalks kills and eats insect is | a carnivore, consumer |
| nitrogen fixation is carried out by | bacteria |
| as PCP's move up the food chain their concentration | increases |
| major cause of ozone depletion | chlorofluorocarbons |
| greatest threat to biological diversity | habitat destruction |
| using renewable resources to save the future is | sustainable development |
| graph of exponential growth | looks like a J curve |
| a limiting factor is | a condition that keeps population from growing |
| Examples of limiting factors | space, food, disease |
| define density-independent factor | factor limits population, like fire, tornado, drought |
| tendency for warm air to rise cool air sink results in | global wind patterns |
