What was the biggest obstacle for the theory of continental drift to overcome? 1. no answer for how the continents moved

2. Wegener wrote all his work in a language no one could read

3. land bridges had better evidence

4. there was no concrete evidence for continental drift
PICK ONE

The answer Is A: No answer for how the continents moved.

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.