Ameasurement of an ore mixture at equilibrium shows 2.1xl0^4 times as many^235u atoms as^231pa atoms. calculate the half-life of^235u from the assay data and the known half-life of^231pa (3.28x10^4 yr).

gans

explanation:

vestigial organs (like your appendix) are organs that no longer serve a purpose.

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i just did this and got a 100.

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

do you have a formula possibly