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All living things are made up of cells, which is the smallest unit that can be said to be alive. An organism may consist of one single cell (unicellular) or many different numbers and types of cells (multicellular).
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Credits:
"Sphagnum moss in May 2010" by Gary Peeples/USFWS, licensed under a Creative Commons Attribution License (CC BY 2.0):
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"Algae in sphagnum moss cells 2" by Казаков Александр Павлович/Nowhere Insect, licensed under a Creative Commons Attribution License (CC BY 4.0):
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"Living cells of onion epidermis" by Berkshire Community College Bioscience Image Library [Public domain], via Wikimedia Commons:
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"Sedimented red blood cells" by MDougM [Public domain], via Wikimedia Commons:
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"EscherichiaColi NIAID" by Rocky Mountain Laboratories, NIAID, NIH [Public domain], via Wikimedia Commons:
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"Compound Microscope (cropped)" by Acagastya [Public domain], via Wikimedia Commons:
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"LEGO City 10159 LEGO City Airport" by Jinko Cruz, licensed under a Creative Commons Attribution License (CC BY 2.0):
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"A curious kitten" by Dimitri Houtteman [Public domain], via Wikimedia Commons: [ Ссылка ].jpg
"Cell culture (HeLa cells) (261 18) Cell culture (HeLa cells) - metaphase, telophase" by Doc. RNDr. Josef Reischig, CSc., licensed under a Creative Commons Attribution License (CC BY-SA 3.0):
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"Bryum capillare leaf cells" by Des_Callaghan licensed under a Creative Commons Attribution License (CC BY-SA 4.0):
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