SCENARIO: A research team is studying the diversity of microscopic organisms in a freshwater pond ecosystem. They collected samples from three different locations (L1, L2, L3) and analyzed them under a microscope. Their observations are summarized below: **Location L1:** Abundant unicellular organisms with distinct cell walls made of cellulose, photosynthetic pigments, and some colonial forms. **Location L2:** Primarily multicellular, filamentous organisms with chitinous cell walls, heterotrophic nutrition, and reproduction via spores. **Location L3:** Diverse prokaryotic organisms, including some capable of nitrogen fixation, some chemosynthetic, and others parasitic. No true nucleus or membrane-bound organelles were observed in any organisms from this location. Based on these observations, the team aims to classify these organisms into appropriate biological kingdoms.