Classify the following under the headings 'cell structure', 'tissue', 'organ' or 'system'.
Bone, nucleus, skeleton, brain, nerve, mitochondrion, muscle, cytoplasm, epithelium, heart and blood vessels, stomach, alimentary canal, lung, lungs and windpipe

Respuesta :

it is system because bone nucleus and all the rest you put down are all a system structure in the body 
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