Two examples provide evidence for natural selection
natural selection in response to introduced plant species, and the evolution of drug-resistant bacteria
the bacterium _________ is commonly found on people's skins or in their nasal passages
staphylococcus aureus (more than one pathway)
_______ strains are dangerous pathogens
MRSA (methicillin-resistant S aureus)
natural selection doesn't ________ but ____________
doesn't create new traits, but edits or selects traits already present
evolution is a process of ________
descent with modification
related species can have characteristics with ___________ that function __________
underlying similarity, differently
is similarity resulting from common ancestry
homology
are anatomical resemblances that represent variations on a structural theme present in a common ancestor
homologous structures
___________ revels anatomical homologised not visible in adult organisms
comparative embryology
are remnants of features that served important functions in the organism's ancestors
vestigial structures
is the evolution of similar, or analogous, features in distantly related groups
convergent evolution
______ arise when groups independently adapt to similar environments in similar ways
analogous traits
convergent evolution does not ______
provide information about ancestry
the fossil records provides evidence of
the extinction of species, the origin of new groups, and changes within groups over time
the study of the geographic distribution of species, provides evidence of evolution
biogeography
earths continents were formerly united in a single large continent called
Pangaea
are species that are not found anywhere else in the world
endemic species
_______ have many endemic species
islands closely related to mainland