As the days shorten and winter approaches, the leaves of deciduous birch trees living in Florida turn yellow and begin to fall o
ff. However, other types of trees, called evergreens keep their leaves all year round. How does this compare with seasonal changes of trees in other areas of the United States? A. Many other areas of the country have both deciduous trees and evergreen trees. B. Other areas of the country have deciduous trees, but they never lose their leaves. C. Florida is the only place where there are both deciduous and evergreen trees. D. The rest of the country has only evergreen trees, so autumn is much less colorful in those areas.
D. The rest of the country has only evergreen trees, so autumn is much less colorful in those areas.
Explanation:
The deciduous birch forests of the eastern United States have been reducing their territory by anthropic action. Yet in Florida it still persists. In these forests, plants such as birches do not support the harsh winters and that is why they have the strategy of losing their leaves. they start to turn their yellow leaves in the fall season. In other areas of the country where there are coniferous forests, grasslands and grasslands, trees have other strategies and generally have evergreens trees.
Gas exchange occurs at the alveoli in the lungs and takes place by diffusion. The alveoli are surrounded by capillaries so oxygen and carbon dioxide diffuse between the air in the alveoli and the blood in the capillaries.
