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.

Zirconium has an hcp crystal structure and a density of 6.51 g/cm3. (a) what is the volume of its unit cell in m3? (b) if the c/a ratio is 1.593, compute the values of c and a.

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Why do different substances have diffrent properties