A Characteristic that helps an organism survive and reproduce in its environment.
A group of organisms that mate with one another to reproduce fertile offspring.
The process in which inherited characteristics within a population change over generations such that new species sometimes arise.
The trace or remains of an organism that lived long ago,most commonly preserved in sedimentary rock.
A historical sequence of life indicated by fossils found in layers of the earths crust.
A genetically determined characteristic.
The human practice of breeding animals or plants that have certain desired traits.
The process by which individuals that are better adapted to their environment survive and reproduce more successfully then less well-adapted individuals do.
A time period between the birth of one generation and the birth of the next generation
Formation of new species as a result of evolution.