In ecological terms, a landscape is best defined as:

In ecological terms, a landscape is defined as a collection of different ecosystems that interact with one another. This concept recognizes that ecosystems do not exist in isolation, but rather are part of a larger framework that includes various habitats, species, and environmental conditions. Landscapes are typically characterized by their biodiversity and the variety of ecological processes occurring within them.

This definition allows ecologists to study how different ecosystems within a landscape influence each other, how they respond to environmental changes, and how these interactions contribute to the overall health and stability of the environment. A landscape can include forests, grasslands, wetlands, and urban areas, all of which contribute to the ecological dynamics of the region.

The other choices do not encapsulate the complexity of a landscape. A single type of organism represents a narrow focus on biodiversity, while the totality of Earth's biomes refers to a larger categorization of ecosystems rather than the specific interactions within localized areas. A small isolated habitat, however, overlooks the broader connections and interactions found in different ecosystems that collectively form a landscape.