Invasive Species-Brome Grass
An invasive species outcompetes native species due to them not having natural predators in the area. The presences of these species decreases biodiversity and strongly alters ecosystems. Depending on the species they can have dramatic impacts on soil health, damaging the native plants nearby. Invasives get introduced in many different ways, for ornamental reasons, bottoms of shoes or on clothes.
Top photo: C (Flickr)