What is the size range of protozoa?22 of 12050 to 100 micrometers3 to 300 micrometers1 to 10 micrometers500 to 1000 micrometers

The size range of protozoa typically falls between 1 to 1000 micrometers, but most commonly they are within the range of 1 to 300 micrometers.

To analyze the provided options in the question:

1. 50 to 100 micrometers: This is too narrow as it excludes many protozoa.
2. 3 to 300 micrometers: This is a valid range as it covers many commonly found protozoa.
3. 1 to 10 micrometers: This is too small, as while some protozoa may be this size, many larger ones exist.
4. 500 to 1000 micrometers: This is a range that typically exceeds the size of most protozoa, especially considering species diversity.

Final Answer

The best option is 3 to 300 micrometers, as it accurately represents the typical size range of protozoa.