What is a tissue?

A tissue is a group of similar cells working together to perform a common function.

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What is an organ?

An organ is a group of different tissues working together to perform a common function.

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What is an organ system?

An organ system is a group of different organs working together to perform a common function.

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What are the levels of organisation in organisms, from least complex to most complex?

cells ➔ tissues ➔ organs ➔ organ systems ➔ organisms

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What is epithelial tissue?

Epithelial tissue is made up of a layer of epithelial cells and forms a lining for many organs. 

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What is ciliated epithelium?

Ciliated epithelium is a tissue made up of ciliated epithelial cells and goblet cells. It lines organs like the trachea where it sweeps away mucus. 

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What is the function of the xylem?

The xylem transports water and minerals inside plants.

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What is the function of the phloem?

The phloem transports organic materials like sugars in plants. 

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