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Name: Cells and Heredity 1.1 and 1.3 Study Guide Vocabulary to Know Microscope Bacteria/Bacterium Unicellular Multicellular Cell Tissue Organ Organ/Body System Organism Specialization Concepts to Know The Three Parts of the Cell Theory 1. Cells are the smallest unit of living things 2. Living things are made of one or more cells 3. Cells come from other living cells Levels of organization of multicellular organisms Simplest to ----------------------------------------------------------------------Most Complex Cell ------ Tissue ------ Organ ------ Organ/Body System ------ Organism Name: Four Characteristics of Living Things 1. Ability to respond to the environment 2. Ability to Reproduce 3. Organized body plan/structure (to meet its needs) 4. Develop and Grow People to Know Robert Hooke = first to call them cells (1660s) Anton van Leeuwenhoek = first to observe unicellular organisms (1670s) Louis Pasteur = conducted experiments using broth and bacteria to help strengthen the cell theory (1800s)