1. why were asian carp introduced in the united states?
a. to clean tanks in fisheries
b. to improve sport fishing in lakes
c. to provide a food source in some areas
d. they migrated to the united states in their own

2.how long did it take to stop the flow of oil from the deepwater horizon incident ?
a. 2 days
b.29 days
c. 53 days
d. 87 days

3. some kinds of algae prodice toxins
a. true
b. false

4. a non-renewable resource can always be replaced with a sythetic version
a. true
b. false

5. how many small pieces of trash are estimated to be in each square mile of the great pacific garbage patch?
a. 1 million
b. 8.3 million
c. 1.9 million
d. 6.2 million