Instinctive behavior occurs when an animal has a particular internal state while it is in the presence of a specific external stimulation called a releaser or a sign stimulus.
How many ships did the U-boats sink? During the war the U-boats sank about 2,779 ships for a total of 14.1 million tons GRT. This figure is roughly 70% of all allied shipping losses in all theatres of the war and to all hostile action. The most successful year was 1942 when over 6 million tons of shipping were sunk in the Atlantic.
They are smaller than oceans and typically located where the land and ocean meet. 1  It is often said that sailors sail the seven seas of the world, but is this an accurate representation of the amount of seas on the Earth? There are in fact 108 seas (including the five oceans) on the planet. They vary immensely in size and have different characteristics. The Dead Sea borders Israel and Jordan. It is famous for its scrolls and high salt content, which is six times higher than the ocean.