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The key concepts in Part 1 are briefly reviewed. Organisms in the Protista Kingdom are virtually all single-celled. Most are heterotrophic, some are autotrophic like algae, a few like euglena are both. Most reproduce asexually, but occasionally some also sexually which produces genetic variation and long term evolutionary benefits.

Euglena is a protist whose behavior is both plant-like and animal-like (protozoan). Structures Like a mobile protozoan, its structures include a flexible outer membrane called a pellicle (not a plant-like rigid cell wall), and a flagellum for locomotion).