Final answer:
One example of invasive species displacing native species and altering ecosystem properties is the purple loosestrife, an invasive plant species in the United States.
Step-by-step explanation:
Invasive species can displace native species and alter ecosystem properties. An example of this is the purple loosestrife (Lythrum salicaria), which is an invasive plant species in the United States. It outcompetes native plants for resources, disrupts the natural balance of the ecosystem, and reduces biodiversity. This negatively impacts native plant and animal species that depend on the native vegetation for food and habitat.