Question

boundaries are the divisions between two physical conditions. boundaries normally result between different materials or between

molecules in a uniform material
the same material with different conditions
electrons in the same material under the same conditions

Explanation:

Boundaries occur between two physical conditions. When considering the options, different materials or the same material with different conditions (like a material in solid and liquid states) can create boundaries. Molecules in a uniform material (same material, same conditions) don't form a boundary. Electrons in the same material under the same conditions also don't create a boundary as there's no change in physical conditions.

Answer:

the same material with different conditions