Protozoa — identify the attribute that protozoa are generally NOT characterized by

Introduction:
By definition, protozoa are single-celled eukaryotes. This question tests recognition of their basic organizational level and key cellular features.

Given Data / Assumptions:

• We compare multicellularity versus unicellularity.
• Other traits: microscopic scale, no rigid cell wall, eukaryotic nature.

Concept / Approach:
Protozoa are unicellular eukaryotes, typically lacking rigid cell walls (unlike fungi/algae). They are microscopic and possess membrane-bound organelles and nuclei, defining them as eukaryotic.

Step-by-Step Solution:

Verification / Alternative check:
Standard protozoology sources define protozoa as single-celled; colonies may exist, but each unit is an independent cell, not a true multicellular organism with tissues.

Why Other Options Are Wrong:

• Microscopic: matches typical size.
• No rigid wall: characteristic feature facilitating phagocytosis and motility.
• Eukaryotic: nucleus and organelles are present.

Common Pitfalls:
Confusing colonial aggregations with multicellular tissue-grade organization.

Final Answer:
Multicellular organization