Which demographic challenge is europe currently experiencing? a. an aging and decreasing population b. a baby boomc. an unequal distribution between males and females d. a large group of teenagers moving through the school system(i chose a but i'm unsure)(i cant delete my last question, sorry)

The correct answer is - A. An aging and decreasing population.

Europe is a continent that has big troubles with the low birth rates in the past few decades. In almost all of the countries on the continent the birth rates are very low, not even enough for the population to stay at a same number, even though for such a thing, only an average of two children per women are needed. There's actually only two countries (three if we count Kosovo) in Europe that have birth rates high enough for the population to grow, Ireland and Albania.

The life expectancy is also relatively high in Europe, so the low birth rates, and high life expectancy are resulting in an aging population, which is slowly declining, but that decline is expected to increase significantly in the near future.

the captain of a steam ship naturally chooses the shortest route to his destination. since a sailing ship is usually pushed by winds and currents, its captain must find a route where the wind will probably blow in the right direction. tacking, i.e. using contrary wind to pull (sic) the sails, was always possible but wasted time because of the zigzagging required, and this would significantly delay long voyages. the early european explorers were not only looking for new lands. they also had to discover the pattern of winds and currents that would carry them where they wanted to go. during the age of sail winds and currents determined trade routes and therefore influenced european imperialism and modern political geography. for an outline to the main wind systems see global wind patterns.

pilotage or cabotage, in one sense, is the art of sailing along the coast using known landmarks. navigation, in one sense, is the art of sailing long distances out of sight of land.[1] although the polynesians were able to sail the pacific (with great difficulty) and people regularly sailed north and south across the mediterranean, before the time of columbus nearly all sailing was coastal pilotage

        it is some were in here? ///

there are no mutiple choices here