What do is the main idea of lewis and clark in sentence

answer-the island had airfields that the u.s. military needed.

this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.

c. troops marched forward in close formation against newer, more accurate weapons

food chain i would say only because there is competition on getting food and survival