Green invaders are taking over
America. Nope, not invaders from space. Plants. You might not think of
plants as dangerous, but in this case they are threatening nature's
delicate food web.The invaders are plants from other countries brought here to make gardens and yards look pretty. Ever since people started to arrive on America's shores, they've carried along trees, flowers, and vegetables from other places.
Now there are so many of those plants, they are crowding out the native plants that have lived here since before human settlers arrived.
