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Organizing The Ecosystem

Across
When an organism entered a new habitat
Food could be one of them. It causes death and emigration.
When an organism left its current habitat
Down
When different groups/clusters of organisms live together and interact with each other. Interaction could be fatal for some.
A term describing a group/cluster of organisms that of the same species.
A creation. Some are very simple and some are very complex. The most basic unit is called cell.