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This stack includes both terms/defs AND "target practice" with images.

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Term
Definition
living   something that has all the characteristics of life: organization, reproduction, adjust to surroundings, grow and develop, and use energy from chemical reactions  
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non-living   anything that does not have all the characteristics of life  
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structure   the shape and parts of something and how they're put together  
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function   the job something does and how it works  
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level of organization   the bigger and smaller parts of a system that all work together to make the system work  
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organelle   tiny structure inside a cell that carries out a specialized function  
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cell   the smallest living part of an organism that can live by itself  
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tissue   a group of cells working together (a level of organization in a multicellular organism)  
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organ   a group of tissues working together (a level of organization in a multicellular organism)  
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organ system   a group of organs working together (a level of organization in a multicellular organism)  
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organism   science name for a 'living' thing that has all the characteristics of life  
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cell membrane   organelle that is the outer boundary of a cell and which only lets certain things in and out  
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cell wall   organelle in a plant or bacteria cell that is outside the cell membrane and which gives rigid support to the cell  
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cytoplasm   liquid filling of a cell in which the organelles float  
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nucleus   organelle that contains all the instructions for how to run a cell  
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mitochondrion   organelle that chemically reacts oxygen with sugars to release energy, carbon dioxide, an d water  
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chloroplast   organelle in a plant cell that uses sunlight energy to chemically react carbon dioxide with water to produce sugars and oxygen  
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vacuole   organelle that stores materials inside a cell  
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unicellular   adjective to describe an organism made of only one cell  
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multicellular   adjective to describe an organism made of many cells  
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nervous system   organ system in humans that communicates information within the body and communicates information between the body and the outside world  
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muscular system   organ system in humans that makes voluntary and involuntary movement possible  
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skeletal system   organ system in humans that provides structure and protection and which muscles pull against  
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digestive system   organ system in humans that breaks down and absorbs nutrients from food  
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excretory system   organ system in humans that filters out and gets rid of waste  
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respiratory system   organ system in humans that pulls oxygen into the body and gets rid of carbon dioxide  
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circulatory system   organ system in humans that moves blood to all tissues and organs in the body  
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