It might be that its difficult to digest food.
Answer:
Becuase they can go through mountains and hills, they curve of of those.
Answer:
yes, it is a homogeneous mixture because the different parts cannot be seen.
Explanation:
The basic units for density is

and any get of units that has those units in the proper place can be considered a density unit. The ones that has those specifically are A, B, E and F