How did bighead and silver carp come to live in the Missouri River? Nutria damaged the habitat and food web in the Gulf Coast and the Chesapeake Bay by eating wetland grasses and rushes. How do grasses and rushes contribute to marsh ecosystems?

. How does ballast water play a role in spreading invasive species to new regions?
11. The Living Planet Index measures changes in biodiversity in animals with backbones, otherwise known as vertebrates. These include fish, mammals, reptiles, amphibians, and birds. How much of the vertebrate population was lost in the forty-four years between 1970 and 2010? (1)
12. The Living Planet Index measured loss of biodiversity in vertebrates only. Only a small percentage of species on Earth are vertebrate animals. We are losing other kinds of species as well. Why don’t we know exactly how many species we lose every year? (2)