Who used the first standardized system of measurement?
a.
the romans and greeks
c.
the egyptians and babylonians
b.
the neanderthals
d.
the french and germans

In all living cells dna controls cellular activities by

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.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: