Wegener first began to think about his continental drift hypothesis when he noticed a similarity in on different continents.
a)coastlines
b)animals
c)climates
d)cultures

ugh fiel iente of insistí is did kiwis jaj

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.