Why did europeans explore far away places during the 15th and the 16th century?

 In the 15th century the overland routes were being controlled by the Turkish Empire, which made it even more difficult for European merchants to pass through.

As a result to this, some European countries, like Spain and Portugal, decided to find out if there was a sea route to India. With the help of new kinds of ships that could sail faster and instruments , like the quadrant, they started the Age of Exploration.

I hope this is what you needed.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)