The helium and oxygen will occur at the top, the sugar and water will be found at the middle while the oil will be found at the bottom.
A mixture is composed of several substances which are not chemically combined together hence they can be segregated into layers.
Thus, if the mixture is segregated into three layers, the helium and oxygen will occur at the top, the sugar and water will be found at the middle while the oil will be found at the bottom.
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