The introduction of invasive North American ctenophores into the Black Sea and the Sea of Azov has
A) given unexpected help to the fisheries there by providing a new food source.
B) resulted in the extinction of the native European ctenophores.
C) decimated fisheries because the invasive species competes for food with commercial fish species.
D) crippled the tourist industry because ctenophores sting swimmers.
Question 2
Which one of the following is not an example of use of biomass energy of a forest?
A) Indigenous peoples harvest tagua nuts from trees in a rain forest, carve them into animal sculptures, and sell them in the local market to tourists.
B) While hiking through a forest in the Appalachian Mountains, some college students gather dead branches from the ground to make a fire for cooking dinner.
C) Native people living on the Brazilian coast earn money by cutting mangrove trees and converting the wood into charcoal.
D) In downstate Illinois, a farmer cuts up dead standing trees from a forest on his property and delivers the firewood to people living in the suburbs of St. Louis.
Survivorship curve for the North American beaver.
black sand
Painting of a Colonial American boy holding a pet squirrel.
Male South American Knob-billed Duck (S. m. sylvicola)
A sod house in North Dakota, 1896. Individual “bricks” of sod were hewn from the ground and stacked
Booker T. Washington in his office at Tuskegee Institute, 1900. Washington chose a policy of accommo