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Question
Put the following in order from smallest to largest: organ, organism, cell, tissue, organ system.
Solution
Cells make tissues; tissues make organs; organs make organ systems; organ systems make the organism.
Answer
cell → tissue → organ → organ system → organism.
A group of cells with similar structure and function working together.
A collection of different tissues working together to perform a specific function.
A group of organs working together to perform a particular complex function (e.g. digestion).
Mistake
Treating 'cell' and 'tissue' as the same.
Why it happens
Both are small.
How to avoid it
Cell = individual unit. Tissue = group of similar cells.