alleryStart learning →What is the smallest unit of a living thing?
AA single cell
BA single tissue
CA single organ
DA whole organism
Answer & Solution
Correct answer: A. A single cell
1. A living thing may be built from one cell or from many cells.
2. Below the cell there is no smaller unit that is itself alive.
3. Tissues, organs and whole organisms are all assemblies of cells, so each of them is larger than the smallest living unit.
4. The smallest unit of a living thing is therefore a single cell.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.1 Studying Cells_
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