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

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.