Which characterization accurately describes both conduction and convection

Both conduction and convection need matter to transfer thermal energy.

Both only occur when currents are created by different densities.

Conduction involves collision of particles, while convection involves the movement of a liquid or gas.

or both only occur when currents are created by different densities.  

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the match duh

explanation:

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.