Question

how is an eukaryote classified as a protist?

a eukaryote is classified as a protist if it is missing either chloroplasts or mitochondria.
a eukaryote is classified as a protist when it cannot be classified in any other eukaryotic group.
a eukaryote is classified as a protist if its nuclear membrane does not dissolve during mitosis.
a eukaryotes is classified as a protist if it is unicellular.

Explanation:

Protists are a diverse group of eukaryotes. They are often considered a 'catch - all' group for eukaryotes that don't fit into the other well - defined eukaryotic kingdoms (fungi, plants, animals).

Answer:

A eukaryote is classified as a protist when it cannot be classified in any other eukaryotic group.