Give two examples of artificial or man-made ecosystems. List the salient features by which they differ from natural ecosystems.

(N/A) Two examples of artificial or man-made ecosystems are $1.$ Aquarium and $2.$ Crop fields (farm houses).
Salient features by which they differ from natural ecosystems:
$1.$ Maintenance: In artificial ecosystems,biotic and abiotic components are maintained artificially. For example,in an aquarium,oxygen supply,cleaning,and food are provided by humans,whereas in natural ecosystems,these processes occur naturally.
$2.$ Stability: Natural ecosystems are self-sustaining and stable,whereas artificial ecosystems are unstable and require constant human intervention for their survival.
$3.$ Diversity: Natural ecosystems typically possess high species diversity and complex food webs,while artificial ecosystems have low species diversity and simplified food chains.
$4.$ Ecological Services: Natural ecosystems provide essential ecological services like nutrient cycling,water purification,and climate regulation,which are largely absent or minimal in artificial ecosystems.