Grasslands are not forest ecosystems because they are dominated by grasses and other non-woody plants, rather than trees.

Deserts are characterized by low humidity due to the lack of water and vegetation.

Forests cover approximately 30% of the Earth's land surface, making them the largest terrestrial biome.

Swamps, marshes, and bogs are all types of wetland ecosystems characterized by waterlogged soils and abundant plant life.

Natural selection, evolution, and adaptation are all terms used to describe the process by which organisms change over time in response to their environment.

Elephants are considered keystone species in the African savanna because they play a crucial role in shaping the ecosystem through their feeding and foraging habits.

Ecology is the study of the interactions between organisms and their environment, including the physical, chemical, and biological factors that affect their survival and distribution.

Coral reefs, estuaries, and mangrove forests are all types of marine ecosystems that support a diverse range of marine life.

Food chain, food web, and trophic levels are all terms used to describe the process by which energy flows through an ecosystem from producers to consumers.

Lakes, rivers, and ponds are all types of freshwater ecosystems that support a variety of aquatic plants and animals.

Competition is the process by which organisms compete for resources such as food, water, and territory in an ecosystem.

Mutualism is a type of symbiotic relationship in which both organisms benefit from the association.

Decomposition is the process by which organisms break down organic matter into simpler substances, such as carbon dioxide and water.

Farms, cities, and parks are all examples of human-made ecosystems that have been created and maintained by humans.

Natural selection, evolution, and adaptation are all terms used to describe the process by which organisms change over time in response to their environment.