What type of ecosystem is characterized by grassland with scattered trees?

The correct answer is savanna, which is a specific type of ecosystem known for its distinctive combination of grassland and scattered trees. This ecosystem typically exists in regions where there is enough rainfall to support the growth of trees but not enough to form a dense forest. Savannas often have a mix of open grass areas and occasional trees or clusters of trees, providing a unique habitat that supports a variety of wildlife.

Savannas are found in several parts of the world, including Africa, Australia, and parts of South America. They are characterized by a warm climate and seasonal changes, with distinct wet and dry seasons. The presence of both grass and trees supports diverse species, including large herbivores like elephants and giraffes, as well as various predators.

In contrast, other ecosystems listed in the options have different characteristics. Deserts are arid regions with very little vegetation, forests are dense areas dominated by a large number of trees, and tundras are cold, treeless regions found in polar areas. Therefore, savanna uniquely describes an ecosystem where grassland and scattered trees coexist.