Descartes undergoes his method of doubt in order to identify beliefs that could serve as a foundation for knowledge. According to his view, these foundational beliefs must be:

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.

answer; ///he could not explain why the continents drifted;

answer; a way of( presenting information), the anthropologist is employing what type of data collection; qualitative;