Emmigration has occured in an ecosystem when individual organisms

Run out of food or sometimes they immigrate to lay eggs and or find s better place to live or stay. As well as people destroying biomes.

Explanation:

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.