An optimistic outlook is related to higher life satisfaction, longer life, and better health. The correct answer is D. all of these are correct.
Since both equations equal y you can do

. then do:

and then you get:
Answer:
it would be eradicate. if you don't believe me look up the word then.
The major limitation would be: not all children have the same opportunity to display a particular behavior in everyday life
Natural observation aimed to find certain explanation for social occurence by observing their behavior in their natural environment.
This method of course couldn't be done if certain group do not possess the freedom to act like other members because of their special circumtances (for example, poor children may expected to obtain part-time job on earlier age)
Lines of latitude are the lines that go from left to right.