CAIE IGCSE Biology 22.3.3 Graphs Charts and Statistics Topic Practice

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22.3.3 Graphs, charts and statistics question 1

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Fig. 4.1 is a diagram of a virus.

Fig. 4.1

Fig. 4.1

The human immunodeficiency virus (HIV) infects and destroys lymphocytes.

The number of lymphocytes in the blood of a person infected with HIV was measured over a period of 84 months.

The results are shown in Fig. 4.2.
number of lymphocytes per mm3\mathrm{mm}^{3} of blood

Fig. 4.2

Fig. 4.2

Describe the changes in the number of lymphocytes, over the 84 months following infection with HIV, shown in Fig. 4.2.

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