Eukaryotic microorganisms include which of the following groups?

Introduction / Context:
Microorganisms span both prokaryotic and eukaryotic domains. Many common microbes—despite their small size—are eukaryotes and have nuclei and organelles.

Given Data / Assumptions:

• Groups listed: protozoa, fungi, algae.
• We decide whether each is eukaryotic.

Concept / Approach:
Protozoa (amoebae, ciliates), fungi (yeasts, molds), and algae (various photosynthetic eukaryotes) are all eukaryotic. They possess membrane-bound organelles and linear chromosomes housed in a nucleus. In contrast, bacteria and archaea are prokaryotic.

Step-by-Step Solution:

Verification / Alternative check:
Standard domain classification (Eukarya) includes these groups; microscopy reveals nuclei and organelles.

Why Other Options Are Wrong:

• A–C individually list eukaryotes, but the comprehensive correct choice is all of them together.

Common Pitfalls:
Confusing cyanobacteria (prokaryotes) with algae; assuming “microbe” implies “prokaryote.”

Final Answer:
all of these