Chemical energy through the process of photosynthesis.
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Adolescent means the development of a child into an adult
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Lipids are found in cell membranes in double layer which is called "Lipid-bilayer".
So, option A is your answer.
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Your answer would be the third option
The variable that researchers manipulate is the independent variable.
The reason for this is because in experiments different manipulations are often introduced. The sole purpose of these manipulations is to see whether they will affect our independent variable and if they will change its value.