Terms in this set (41)
Change in a kind of organism over time; process by which modern organisms have descended from ancient organisms.
The preserved remains or traces of an organism that lived in the past
Selection by humans for breeding of useful traits from the natural variation among different organisms
A characteristic that improves an individual's ability to survive and reproduce in a particular environment.
Ability of an organism to survive and reproduce in its environment
A natural process resulting in the evolution of organisms best adapted to the environment.
Study of past and present distribution of organisms
similar structures that related species have inherited from a common ancestor
Body parts that share a common function, but not structure
A structure that is present in an organism but no longer serves its original purpose
All the genes, including all the different alleles for each gene, that are present in a population at any one time
a measure of how common a certain allele is in the population
random change in allele frequencies that occurs in small populations
Genetic drift resulting from the reduction of a population, typically by a natural disaster, such that the surviving population is no longer genetically representative of the original population.
genetic drift that occurs after a small number of individuals colonize a new area
condition in which the frequency of alleles in a population remains the same over generations
movement of alleles from one population to another
Formation of new species
separation of a species or population so that they no longer interbreed and evolve into two separate species
isolation between populations due to differences in courtship or mating behavior
form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water
form of reproductive isolation in which two populations reproduce at different times
The number of different species in an area
the variety of ecosystems within a given region
Number of different species in the biosphere
the variety of genes within a given species
the rate at which an ecosystem returns to its original state after a disturbance
the processes by which life-supporting resources such as clean water, timber, fisheries, and agricultural crops are produced
Change in the statistical properties of the climate system when considered over periods of decades
An increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)
farming strategy in which large fields are planted with a single crop, year after year
the action of clearing a wide area of trees.
species that enter new ecosystems and multiply, harming native species and their habitats
harmful material that can enter the biosphere through the land, air, or water
a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
air pollution by a mixture of smoke and fog
increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain or food web
economic development that is conducted without depletion of natural resources.
A natural resource that can be replaced at the same rate at which the resource is consumed
Something produced in nature more slowly than it is consumed by humans
A rapid increase in the algal population of a waterway