Why is the protist kingdom sometimes called the odds and ends kingdom.

Because the members of this realm are so different, making it difficult to classify them taxonomically.

Explanation:

The protist kingdom is formed by the protozoa and the unicellular algae, but now also encompasses some multicellular algae (green, brown and red algae), being called Protoctist. It is the first eukaryotic kingdom (they have nucleus and membranous organelles); It is a polyphyletic kingdom (several ancestors gave rise to groups belonging to this kingdom) and as a consequence was later reclassified and divided into several kingdoms. There are no unique characteristics that define the Protoctist realm, the members of this realm are very different and so this realm is sometimes called "odds and ends".  They have very different characteristics: they can be uni or multicellular, aerobic or anaerobic, photosynthetic autotrophic (algae) or ingestion heterotrophic (protozoa).

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solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.