Answer:
![\boxed{\text{(2) A mixture can be separated by physical means.}}](https://img.qammunity.org/2020/formulas/chemistry/middle-school/tc4tseqcj44wbfqaw3wbuzg2k369esv4p1.png)
Step-by-step explanation:
For example, you can separate a mixture of sand and water by pouring it through a coffee filter.
(1) is wrong. A mixture must have at least two components.
(3) is wrong. A mixture can have a any composition depending on the amount of each component.
(4) is wrong. A mixture of sand and water is heterogeneous,