Carbohydrates are made of carbon and oxygen. What is the third
element that makes up a
carbohydrate?
A. hydranium
B. water
C. hydrogen

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Carbohydrates are biological molecules made of carbon, hydrogen, and oxygen

Explanation:

in a ratio of roughly one carbon atom ( Cstart text, C, end text) to one water molecule ( H 2 O \text H_2\text O H2Ostart text, H, end text, start subscript, 2, end subscript, start text, O, end text).

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.