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27. answer --
Cells, tissues, organs and systems
Multicellular organisms are organised into increasingly complex parts. In order, from least complex to most complex:
cells
tissues
organs
organ systems
organism
Tissues
Animal cells and plant cells can form tissues, such as muscle tissue in animals. A living tissue is made from a group of cells with a similar structure and function, which all work together to do a particular job. Here are some examples of tissues:
muscle
the lining of the intestine
the lining of the lungs
xylem (tubes that carry water in a plant)
Organs
An organ is made from a group of different tissues, which all work together to do a particular job. Here are some examples of organs:
heart
lung
stomach
brain
leaf
root
Organ systems
An organ system is made from a group of different organs, which all work together to do a particular job. Here are some examples of organ systems:
circulatory system
respiratory system
digestive system
nervous system
reproductive system
Answer:
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