a trait that helps an organism survive and reproduce
a heritable trait that enhances an individuals fitness; an evolutionary adaption
continuous, low-level rate of extinction not associated with human activities or catastrophic geological events
Process of change in members of a species under the influence of natural selection and requiring much longer time periods than so called cultural evolution
Phenomenon in which individuals with adaptive genetic traits produce more living offspring than do individuals without such traits.
A specific role of a species within an ecosystem, including its use of resources, and relationships with other species.
meaning species that are native to and found only within a limited area
the disappearance of a species when the last of its members dies
traces of ancient organisms that have been preserved in rock or other substances
Inserting genes of one organism into the genes of another. Enzymes are used to cut and copy DNA segments. (ex: insulin cut into bacterial DNA)
Species with a broad ecological niche. They can live in many different places, eat a variety of foods, and tolerate a wide range of environmental conditions. Examples are flies, cockroaches, mice, rats, and human beings.
form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water
event in which many types of living things become extinct at the same time
Random errors in gene replication that lead to a change in the sequence of nucleotides; the source of all genetic diversity
organism's role, or job, in its habitat
separation of species that prevents them from interbreeding and producing fertile offspring
Species with a narrow ecological niche. They may be able to live in only one type of habitat, tolerate only a narrow range of climatic and other environmental conditions, or use only one type or a few types of food.
The process by which a new species evolves from a prior species, the most basic process in macroevolution.