Respuesta :

Chromosomes are structures found in the nucleus of most cells. The plural of nucleus is nuclei. organ A group of different tissues that work together to carry out a particular function, eg heart and lungs. organ system A group of organs that work together to complete a specific function.
Organ systems. For example the mouth,stomach, small and large intestines make up the digestive system. So the organs work together to make up an organ system. 

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