Which of the following is not a characteristic feature of tropical rain-forest habitat?

The characteristic feature of tropical rain-forest habitat that is not listed is "fewer canopy strata than the savannah." Tropical rainforests have a multi-layered canopy with several strata, each containing various species of trees and other plants. The canopy layers can range from 30-40 meters high to as low as 3-5 meters. In contrast, savannahs have a much simpler structure, with fewer and shorter trees that do not form a complex canopy. This difference in the number of canopy strata is due to the fact that the rainforest receives more rainfall than the savannah, allowing for more plant growth and diversity. Therefore, the correct option is the one that mentions the "fewer canopy strata" characteristic.