Match the descriptions of the stages of the act of hearing with the correct stage order.
1.the ear collects compression waves.
2.the hair cells transmit nerve impulses to the brain.
3.the brain interprets the nerve impulses.
4.the ear amplifies the compression waves.
5.the amplified waves stimulate the hair cells of the ear.
stage 1
stage2
stage3
stage4
stage5

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.

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List the path of the respiratory system