How is radioactive decay used to date sedimentary rocks?
the amounts of potassium and argon in sedimentary rocks are measured.
the amounts of carbon-14 and nitrogen in sedimentary rocks are measured.
the amounts of unstable elements in each layer of the sedimentary rocks are compared.
the amounts of unstable elements in the volcanic layers above and below the sedimentary layers are measured.

In which state was more than 100 billion tons of coal mined in 2005?

In the controversial scientific process of cloning, organisms are created that are genetically identical to there parent. this process would be classified as

Select all the correct answers. evolution is the process by which species developed and diversified over the course of earth's history. all life on earth started from simple, single-celled prokaryotes, but some species are more closely related than others. scientists can find clues to these close evolutionary relationships by looking for common characteristics between organisms. based on their anatomical similarities, which three of these organisms share a close evolutionary relationship? snake horse ladybug human bacteria