Evidence indicates that plants increase the number of stomata in their leaves as atmospheric CO2 levels decline. Increasing the number of stomata per unit surface area should have the effect of doing which of the following? 1.increasing dehydration of leaf tissues 2.decreasing dehydration of leaf tissues 3.countering the effect of declining CO2 on photosynthesis 4.reinforcing the effect of declining CO2 on photosynthesis 5.decreasing the O2 content of air next to the leaves lower than it would otherwise be 6.increasing the O2 content of air next to the leaves higher than it would otherwise be

The Kingdom Plantae first appeared about 410 million years ago when green algae transitioned from water to land. The differences between land and sea posed a challenge to early colonizing species, which prompted many new adaptations. These adaptations have resulted in the wide variety of plant forms observed today.

There are an estimated 250,000 species, with the greatest diversity in the moist tropics.