The half-life of uranium-238 is 4. 46x10^9 years. If 4. 46x10^9 years ago a sample contained 4. 0mg of uranium-238, how many milligrams of uranium-238 does the sample contain today?.

List the path of the respiratory system

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.

Adirect relationship can be represented by: a curve a pie chart