TROPOSPHERE is the anwser
It was developed by Alfred Wegener around 1912-1915 time frame. He proposed his theory of the "continental drift". He proposed that the continents plowed through crust of ocean basins. He said that the continents look like a puzzle piece to put together. It's very interesting.
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B.) the available food on the islands
Since these different beaks were adaptions part of their evolution to be able to be more fit to survive with the food available on the island
Damage neurons will impair the transmission of nerve impulses.
C. is the answer