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A mosquito's proboscis, (the part that sucks blood), is the first 1/3 of its body's length. The rest of the mosquito is made up of the head, thorax, and abdomen. How much of a mosquito is the head, thorax, and abdomen?
What is 3/3 - 1/3 = 2/3 of the mosquito is the head, thorax, and abdomen?