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All living things share the following characteristics: 1. Cellular organization 2. Grow and develop 3. Respond to the environment 4. Reproduce Multicellular: Contains many cells Unicellular: Contains only one cell Prokaryotic cell: Does not have a nucleus. Eukaryotic Cell: has a nucleus. Spontaneous Generation: The mistaken idea that living organisms arise from nonliving sources. Cell Theory 1.Every living thing is made of cells. 2.Cells carry out the functions needed to support life. 3.Cells come only from other living cells. Levels of Organization cells tissues organs organ systems organisms