Question

compound
mixture
element
salt water (nacl & h₂o) is an example of an

Explanation:

Salt water is composed of salt (NaCl) and water ($H_2O$). A mixture is a combination of two or more substances that retain their individual properties. In salt water, NaCl and $H_2O$ do not chemically bond to form a new substance with different properties (unlike a compound). They can be separated by physical means (e.g., evaporation). An element is a pure substance made of only one type of atom, which salt water is not.

Answer:

mixture