Early Earth
The disappearance and lack of reappearance of over 80% of organisms illustrated in the fossil records is evidence of what?
Mass Extinction
Structures that have a similar evolutionary origin and structure but are adapted for different purposes such as a whale fin and human arm are called _____________ structures.
Homologous
This type of Natural Selection favors average individuals.
Stabilizing Selection
The supercontinent that existed 300 millions years ago was called what?
Pangea
Scientist measure the amount if radioactive isotopes and determine the specific age of fossils using the ___________ dating method.
Absolute
This adaptation allow some organism to look like others for their protection or safety.
Mimicry
This type of natural selection favors one extreme of the population.
Directional Selection
This type of population is least likely to be devastated by a disease outbreak.
large, generically different population
When an oceanic plate collides with a continental plate and pushes under the continental plate this area is called the ____________ zone.
Subduction
Structures with similar function but not related origin like the wings of a bird and the wings of an insect are called _______ structures.
Analogous
This type of selection favors both extremes of a population.
Disruptive selection
If a group of organisms leave a larger population due to emigration and never return, which mechanism of evolution may be display?
Gene Flow
Scientist can identify the order in which rock units form using which dating method?
Relative Dating or Law of Superposition
The process by which one species diverges and produces one or more new species is called what?
Speciation
Scientist Charles Darwin spent a lot of time studying life on this Island.
Galapagos
In genetic drift the allelic frequency changes because of what?
Chance events
The portions of the Earths crust the moves slowly over the mantel is called__________________.
Tectonic Plates
Two organisms are the same species of they can mate and produce _________ offspring.
Fertile
This type of evolutionary change can either produce beneficial or harmful traits in a population.
Mutations
According to scientist the earth is approximately how old?
4.6 billion years