Symbiotic??????? I'm not 100% sure but this is that I think the answer is
Answer is D. When the concentration of the substance is lower outside he cell than inside the cell.
The best answer is starch.
Starch is a type of carbohydrate.
Carbohydrates are made of simple sugars, namely glucose. A simple sugar is a single molecule of a sugar. A single sugar molecule is called a monomer.
Starch is made of many monomers or units of glucose linked together and is thus called a polysaccharide. When it is broken down, the result is its many glucose units are separated from each other by breaking the chemical bonds that hold them together, and are thus released as simple sugars.
Microscopical observations show the presence of simple in structure, abundant, and pervasive microorganisms. Researchers at the time came to the conclusion that there was a life force in the air.
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