Impressions are easy to find individual characteristics in.

true or

No, soil impressions are not easy to find individual characteristics in because the impression may not be good enough to show distinct patterns like a shoe or tire print or even a four-toed foot. Impression do show class and individual characteristics but it is not easy to identify them.

i think 4.44 moles

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.