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can only occur in populations where there are selective pressures and differences in forms of heritable traits. survival of the fittest
sexual selection, such as competition between males for access to fertile females, frequently influences aspects of body form leads to
tends to keep different populations of a species similar to one another, allele frequencies change owing to immigration, emigration or both
a fire devastates all trees in a wide swath of forest, populations of a tree dwelling frog on either side of the burned area diverge
may differ in size shape and function in major groups of organisms, mutation may lead to major differences between adults of related lineages by altering steps in embryo development. human arm and bird wing
a body part of an ancestor is modified differently in different lines of descent
may be used in cladistic comparison of different species, individuals of the same species
Deep Sea vents
prevelance of iron sulfide cofactors in living organism that life may have arose near
Heat from hydrothermal vents
certain pigments that evolved and were later used in photosynthesis may have originally helped cells detect..
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