Animals Change Ecosystems
Locusts- feed on all the plants in their way
Beavers- make ponds by damming streams
Earthworms- dig holes through soil to bring oxygen to plants roots.
How plants change the ecosystem
People bring plants with them when they move
When a specie of plant is brought into and ecosystem it could harm the plants that are already there.
Zebra Muscles
Animal moved because it stuck to bottom of ships
No predator to control population Grows fast
Takes space and food needed by other animals Other animals may die
Landfills
America makes 1.8 kilogtams of garbage a day
200million tons a year.
Pile of garbage eventually covered with soil and grass.