difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences
The adjustment or changes in behavior, physiology, and structure of an organism to become more suited to an environment
Natural selection in which individuals at one end of the phenotypic range survive or-reproduc more successfully than do other
an individual's collection of genes. The term also can refer to the two alleles inherited for a particular gene.
the end of an organism or of a group of organisms (taxon), normally a species.
any trace of past life. The most obvious fossils are body parts, such as shells, bones, and teeth.
similarity in sequence of a protein or nucleic acid between organisms of the same or different species.
a scientist who studies fossils
the study of the distribution of species and ecosystems in geographic space and through geological time.
the change in allele frequencies that occurs over time within a population.
the ability to survive to reproductive age, find a mate, and produce offspring
the transfer of genetic variation
a process by which two species that could otherwise produce hybrid offspring are prevented from doing so
belief in or the policy of advancing toward a goal by gradual, often slow stages
the tiny remains of bacteria, protists, fungi, animals, and plants
Natural selection in which individuals on both extremes of a phenotypic range-surviv or reproduce more successfully than do i