White fat is found in while brown fat is found in

White fat is found in the belly and brown fat is found in the upper back, front and back of neck.

Explanation:

White fat cells perform the function of energy storage and they also help in maintaining the body temperature by acting as a thermal insulator. Lesser number of blood vessels and mitochondria gives the characteristic light yellow or white colour to white fat.

Brown fat consists of large number of mitochondria containing iron and blood vessels which gives it a characteristic brown colour. Brown fat has the purpose of fat burning. Quantity of brown fat decreases as humans approach adulthood.

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.

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