Final answer:
The answer is 'a) Ecosystem'. An ecosystem consists of living things and nonliving environmental factors in a given area, and its health relies on biodiversity.
Step-by-step explanation:
For an ecosystem to be healthy, it has to have lots of different kinds of plants and animals. The correct option is a) Ecosystem. An ecosystem includes all the living things, such as plants and animals, in a given area, along with the nonliving environment, like water, sunlight, soil, and other physical factors. It is a community of organisms interacting with their abiotic (non-living) environment. Biodiversity, which refers to a wide range of interacting and interdependent species, is crucial in maintaining a steady rate of growth and photosynthesis and thus the health of an ecosystem. Ecosystems are part of biomes, and all biomes together make up the biosphere, the part of Earth where all life exists.