The correct answer is B.
Alfred Wegener was a German geophysicist and meteorologist. One of his greatest works is the theory of continental drift, which was focused on the idea that Earth's continents are slowly drifting around the Earth. He proposed that the continents were compressed into one protocontinent (called Pangaea) and that over time they drifted apart into their current position. Although his theory was not widely accepted in the beginning, continental drift is the basis for today's model of plate tectonics.
If the threaded heating element in a percolator is not very tightly mounted a leak may develop. For percolators, all mating surfaces must be tightly screwed together in order to prevent leaking. A build up of hard water deposits, dried milk and other such substances around the gasket may also result in leaking.
Answer:
Elastic demand
A heart valve
Explanation:
A good with many close substitutes will have a highly elastic demand. This is because an increase in the price of the good will causes the consumers to purchase one of its cheaper substitutes.
If both a diamond necklace and a heart valve for heart attack victims are priced the same, the price elasticity for the heart valve will be lower. This is because the diamond necklace is a luxury good but the heart valve is necessary for the survival of the victim.
Importance of flower cultivation is increasing day by day in Nepal because they understood the income which can be generated by floriculture and the soil also permits the cultivation of the plants at a large scale.
