In the experiment "Do large dogs eat more than small dogs, the dependent variable would be how much food each dog ate
what brand of food the dogs preferred
the size of each doo
All of these choices are correct

should be option 3

Explanation:

dependent variable means what is like the result. independent variables are what changes the experiment e.g the amount of food the dog ate

i think the answer to your question is: settlement of the interior and economic growth. ( ^_^)／