<p><strong>Fig. 2.3.</strong> (<strong>A</strong>) A single diatom cell seen through a light microscope. Numbered ticks are 10 micrometers (µm) apart.</p>

Fig. 2.3. (A) A single diatom cell seen through a light microscope. Numbered ticks are 10 micrometers (µm) apart.

Image courtesy of Bob Blaylock, Wikimedia Commons