Atoms and cells - odd one out

which is the odd one out and why?

piece of metal
apple seed
olive oil
diamond necklace

you super much if you answered this question because i really couldn't figure it out. anyway, it's talking about which one doesn't fit in with the group. is it a cell, an atom, or both? find the one that doesn't fit.

Is it possible to use the energy from two atoms colliding to create a clean burning lasting fuel source with a large amount of force? is it also possible to harness that energy from the two atoms colliding to create a clean energy source that will last for years from just two atoms colliding. is there a possibility to control and store that energy for years but slowly let the energy out enough to power cities cheaper and faster.

You notice a very one-dimensional-thinking snail crawling along one rail of a railroad track. naturally, you remove it to a safer place. but before you do, you observe it as it moves from position xi = -92.9 cm to position xf = -64.9 cm along the rail, as measured from a point where one rail abuts the next. what is the snail\'s displacement δx in centimeters?

In what direction does the medium move relative to the direction of the wave? explain.