In plants water is lost through stomata. Figure 1 shows stomata on the lower surface of a leaf.
Figure 1
0.1 mm
Stoma
0.1 mm
(c)
Calculate the number of stomata per mm2 for the leaf shown in Figure 1.

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.