Answer: C) ecosystem
Step-by-step explanation:
Ecosystem is a biotic community where living things such as plants, animals, humans, birds, insects and others interact with the non-living components of the environment. An ecotone is the transition zone between the two biomes. It is the zone where the two communities meet. Thus this can be a part of the ecosystem. A landscape is the abiotic factor which also be the part of the ecosystem.