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Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)
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.