Both the tropical rain forest and the tropical savanna experience/contain:

I. a canopy and understory of vegetation
II. warm, fairly constant temperatures year round
III. inactivity (estivation) of animals during the dry season
IV. plants with waxy leaf coverings to prevent water loss
V. huge migrations of animals
A) II only
B) I and II only
C) II, III, and IV only
D) III, IV, and V only

The tropical rain-forest and the tropical savanna covers the same region but they are characterized by certain differences between them. The tropical rain-forest lies in the tropical region where the temperature remains relatively high and also receives the maximum amount of sunlight, thereby favoring the growth and expansion of a large number of plants and animal species.

The Savanna are the grasslands that covers most of the region in the tropical areas. There are comparatively less number of tress in this region. It provides the minerals and resources that are essential to all the living organisms that exist in that region.

Both the tropical rain-forest and tropical savanna maintains a warmer and constant temperature ranging from about 20° to 30°C. In winter, the temperature decreases by only a few amount. In addition to this, they both are comprised of vegetation cover and good number of forest canopies. The tall trees in the savanna are scatteredly oriented whereas in the tropical rain-forest they are arranged closer to one another forming dense forest.

Thus, the correct answer is option (B).