These could all go either way, hardness and other special properties are what I'm guessing would be the most accurate in determining the kind of material.
luster, cleavage, streak, and color can all be affected by other factors. but I guess cleavage would also be accurate. so I guess hardness special properties and cleavage would be the most reliable.
Sorry, but where are the ‘items’?
Since it is round and it is the asteroid belt it is most likely that he found a dwarf planet
Answer:
Biological Functions: processes and structures by which organisms adjust to short-term or long-term changes in their environment