This learning resource focuses on unicellular organisms, exploring their characteristics and how they perform all life functions within a single cell. It aims to educate students on the fundamental concepts of unicellular versus multicellular organisms, emphasizing the features and lifestyles of various single-celled organisms such as bacteria, amoeba, and paramecium. The document includes activities for students to observe, think critically, and wonder about these tiny life forms. Key terms are defined, and a comparative table is provided to illustrate differences between unicellular and multicellular organisms. The challenges and questions posed encourage deeper understanding of how unicellular organisms manage their life processes independently.