Scientists estimate that the human body contains about 3 × 1013 cells.
Explain why scientists use estimates for numbers such as this, and describe how a scientist could estimate the number of cells in a thin slice of tissue.
48 exam-style questions on Edexcel GCSE Biology 1.2 Number, size and scale, covering 1.2.1 Number, size and scale with estimations and 1.2.2 Quantitative units in relation to cells. Each one has a worked solution and a mark scheme showing where the marks go.