Sea water is a Mixture.

Explanation:
- Sea water is not an element, as elements are pure substances made up of only one type of atom. Sea water consists of a variety of different elements, such as sodium, magnesium, calcium, and potassium, among others.
- Sea water is not a compound either, as compounds are substances made up of two or more different elements chemically combined in a fixed ratio. While sea water does contain compounds like sodium chloride (table salt), it also contains many other elements and compounds in varying proportions.
- Sea water is not a molecule, as a molecule refers to a group of atoms bonded together. In sea water, the atoms are not bonded together to form molecules, but rather they are dispersed and mixed together.
- Sea water is best described as a mixture. A mixture refers to a combination of two or more substances that are physically combined, but not chemically bonded. In the case of sea water, it is a mixture of water and various dissolved substances, including salts, minerals, and other compounds. These substances are mixed together in varying proportions, and they can be separated from each other through physical processes, such as evaporation or filtration.

In conclusion, sea water is a mixture because it is a combination of water and various dissolved substances, and these substances are not chemically bonded together.

Because in sea water is a mixer of many things like salt, water, many plant waste, animal waste etc……