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.  

(I tried my best to find the answer, let me know if this was helpful, goodluck!)

the median of the data is 4.5.

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.