The principal of original horizontality states that ________ .

• most rocks in the Earth's crust are layered horizontally

• igneous rocks form essentially horizontal layers

• metamorphic gradients are essentially horizontal before deformation

• sediments are deposited as essentially horizontal layers

Fossils are most common in which rock types?

• sedimentary

• igneous

• metamorphic

• all of these commonly contain fossils

Radiometric dating is least useful for ___________ rocks.

• granitic

• basaltic

• metamorphic

• sedimentary

What island did Darwin do most of his investigations?

• Galapagos

• Madagascar

• Hawaii

• Darwins

What type of adaptation is migration?

• mutation

• behavioral

• physiological

• structural

What word describes a trait that helps an organism survive in its environment?

• natural selection

• mutation

• camouflage

• adaptation

What is gene therapy?

• when the virus acts as a messenger to carry DNA to a diseased cell.

• When a gene talks about its youth.

• Who's Gene?

• none of the above.

This is the study of embryos and their development.

• Embryology

• Evolution

• Embryos

• adaptation

This is any alteration in a structure of a function that allows an organism to be better suited for its environment.

• vestigial structures

• adaptation

• embryo

• species

If two organisms have similar traits of DNA they are probably

• share a common environment

• share a common population

• share a common ancestor

• speciation