Final answer:
An ecosystem in a neighbourhood garden is a community of living organisms and their interactions with their non-living environment. It includes the plants, insects, birds, and other organisms in the garden, as well as the soil, sunlight, and water.
Step-by-step explanation:
An ecosystem is a community of living organisms and their interactions with their abiotic (non-living) environment. It can range in size from small, like a neighbourhood garden, to large, like the Amazon Rainforest. In a neighbourhood garden, the ecosystem would consist of the plants, insects, birds, and other organisms present in the garden, as well as the soil, sunlight, and water that they interact with.