Which type of fossil is found in the most recently formed sedimentary rock layer

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.