| 9616386404 | Population | a localized group of individuals of the same species that can interbreed, producing fertile offspring | | 0 |
| 9616386405 | Community | all the organisms that inhabit a particular area; as assemblage of populations of different species living close enough together for potential interaction | | 1 |
| 9616386406 | Ecosystem | all the organisms in a given area as well as the abiotic factors with which they interact | | 2 |
| 9616386407 | Biotic | pertaining to the living organisms in the environment | | 3 |
| 9616386408 | Abiotic | nonliving; referring to physical and chemical properties of an environment | | 4 |
| 9616386409 | Biosphere | the entire portion of earth inhabited by life; the sum of all the planet's ecosystems | | 5 |
| 9616386410 | Niche | the sum of a species' use of the biotic and abiotic resources in its environment | | 6 |
| 9616386411 | Clumped Distribution | individual aggregated patches, some organisms group together where food is abundant | | 7 |
| 9616386412 | Uniform Distribution | evenly spaced, some organisms maintain evenly distributed spacing to avoid aggressive interactions between neighbors | | 8 |
| 9616386413 | Random Distribution | unpredictable spacing, some plants grow in random groups if their seeds were windblown across an area | | 9 |
| 9616386414 | Population Ecology | the study of populations in relation to their environment, including environmental influences on populations, on population density and distribution, age structure, and variations in population size | | 10 |
| 9616386415 | Birth Rate | rate of annual birth within a population | | 11 |
| 9616386416 | Death Rate | rate of annual death within a population | | 12 |
| 9616386417 | Sex Ratio | ratio of females to males within a population | | 13 |
| 9616386418 | Age Structure | the relative number of individuals of each age in a population | | 14 |
| 9616386419 | Immigration Rate | the rate of influx of new individuals INTO a population from other areas | | 15 |
| 9616386420 | Emigration Rate | the rate of movement of individuals OUT of a population | | 16 |
| 9616386421 | Carrying Capacity | the maximum population size that can be supported by the available resources, (symbolized by K) | | 17 |
| 9616386422 | Density Dependent | any characteristic that varies according to an increase in population density | | 18 |
| 9616386423 | Exponential Growth | growth of a population in an ideal, unlimited environment, (represented by a J-Shaped curve when population size is plotted over time) | | 19 |
| 9616386424 | Logistical Growth | population growth that levels off as population size approaches carrying capacity | | 20 |
| 9616386425 | K-Selected | stabilize around carrying capacity, have fewer offspring later in life, mature later, live longer and invest more parental care | | 21 |
| 9616386426 | R-Selected | reside in unstable environment, have many offspring early in life, mature earlier, shorter life span, no parental care | | 22 |
| 9616386431 | Symbiosis | an ecological relationship between organisms of two different species that live together in direct and intimate contact | | 23 |
| 9616386432 | Commensalism | a symbiotic relationship in which one organism benefits but the other is neither helped nor harmed | | 24 |
| 9616386433 | Mutualism | a symbiotic relationship in which both participants benefit | | 25 |
| 9616386434 | Parasitism | a symbiotic relationship in which one organism (the parasite) benefits at the expense of another (the host) by living either within or on its host | | 26 |
| 9616386437 | Predation | an interaction between species in which one species (the predator) eats the other (the prey) | | 27 |
| 9616386438 | Aposematic Coloration | the bright coloration of animals with effective physical or chemical defenses that acts as a warning to predators | | 28 |
| 9616386439 | Batesian Mimicry | a type of mimicry in which a harmless species look like a species that is poisonous or harmful to predators | | 29 |
| 9616386440 | Cryptic Coloration | camouflage that makes a potential prey difficult to spot against its background | | 30 |
| 9616386441 | Mullerian Mimicry | a mutual mimicry by two unpalatable species | | 31 |
| 9616386443 | Climax Community | in a community of organisms in a specific area there is one state of equilibrium controlled solely by climate | | 32 |
| 9616386444 | Succession | the process by which the structure of a biological community evolves over time | | 33 |
| 9616386445 | Primary Succession | a type of ecological succession that occurs in an area where there were originally no organisms present and where soil has not yet formed | | 34 |
| 9616386446 | Secondary Succession | a type of succession that occurs where an existing community has been cleared by some disturbance that leaves the soil or substance intact | | 35 |
| 9616386449 | Herbivore | an animal that eats mainly plants or algae | | 36 |
| 9616386450 | Carnivore | an animal that mainly eats other animals | | 37 |
| 9616386451 | Detritivore | a consumer that derives its energy and nutrients from nonliving organic material such as corpses, fallen plant material, and the wastes of living organism (a decomposer) | | 38 |
| 9616386452 | Food Chain | the pathway along which food energy is transferred from trophic level to trophic level, beginning with producers | | 39 |
| 9616386453 | Food Web | the interconnected feeding relationships in an ecosystem | | 40 |
| 9616386454 | Trophic Levels | the positions organisms occupy in a food chain |  | 41 |
| 9616386455 | Secondary Consumer | a carnivore that eats herbivores | | 42 |
| 9616386456 | Primary Consumer | a herbivore; an organism that eats plants or other autotrophs | | 43 |
| 9616386465 | Competitive Exclusion Principle | the concept that when populations of two similar species compete for the same limited resources, one population will use the resources more efficiently and have a reproductive advantage that will eventually lead to the elimination of the other population | | 44 |
| 9616386466 | Resource Partitioning | the division of environmental resources by coexisting species such that the niche of each species differs by one or more significant factors from the niches of all the coexisting species | | 45 |
| 9616386474 | Decomposers | organisms that absorb nutrients from nonliving organic material such as corpses, fallen plant material, the wastes of living organisms and converts them into inorganic forms; a detritivore | | 46 |
| 9616386478 | Invasive Species | a species often introduced by humans, that takes hold outside its native range | | 47 |
| 9616386489 | Density dependent factor | factor that affects population based on size (disease, predation etc) | | 48 |
| 9616386490 | Density independent factor | factor that affect population regardless of size (weather, humans etc) | | 49 |
| 9616386491 | Species diversity | variety of organisms in a community | | 50 |
| 9616386492 | Species richness | the number of different species in a community | | 51 |
| 9616386493 | Relative abundance | evenness of distribution of individuals among species in a community | | 52 |
