Why was it difficult to make political changes in Mexico for most of the 20th century? * Elections were held infrequently.
The country lacked a powerful leader,
The government lacked a legislative branch.
One political party controlled the government.

Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel