Intro to Living Things Study Guide Do you know… The six characteristics of all living organisms? (p.9 C) What all living things are made of? (p. 9 C) What a stimulus is? (p. 55 C) The advantages of being multi-cellular? (p. 43 C) What it means for a cell to be “specialized.” (p. 43 C) The levels of organization? (p. 44 C) What makes tissues? What makes organs? What makes organ systems? What plant cells have that animal cells do not? (see notes) What those plant cell parts do? What photosynthesis is? (p. 52 C)