Why is it difficult to classify protists? Select three options.

There are many varying characteristics and exceptions to each type of protist.
They have been previously categorized based on what they are not.
They are all eukaryotes composed of one or more cells that contain nuclei.
There are no exceptions to the characteristics of each type of protist.
They are microscopic and therefore too small to study accurately.
Recent studies show that protists have not descended from one common ancestor.

Please help me, I have a bad grade in science so far : (

There are many varying characteristics and exceptions to each type of protist.

They have been previously categorized based on what they are not.

Recent studies show that protists have not descended from one common ancestor.

Explanation:

Scientists used to lump protists into a single kingdom, and they still use this classification for some purposes. However, science has largely recognized that the taxonomic grouping known as Kingdom Protista actually includes a wide range of organisms that are not particularly related.

whats the answer to your question?

request for reexamination