Question

1. preserving entire ecosystems rather than individual species is a good conservation strategy because

o a. only endangered species will be saved
o b. developers will have greater access to land
o c. more than one species can be saved.
o d. it will not be necessary for environmentalists to study the ecosystem

1. where are some of the unique ecosystems of the united states? *

o a. in pacific northwest and california
o b. in the florida everglades and hawaii
o c. both (a) and (b)
o d. none of the above

1. how did the cites treaty reduce the slaughter of elephants? *

o a. it offered a bounty to tribal leaders for identifying poachers
o b. it banned imports and exports of all ivory worldwide
o c. it limited sales of ivory to the antique market
o d. both (a) and (c)

1. why are biologists uncertain about how many species are living on earth?

Explanation:

1. Preserving entire ecosystems rather than individual species is a good conservation strategy because an ecosystem consists of multiple species interacting with each other. By protecting the ecosystem, more than one species can be saved. Option a is incorrect as it's not just about endangered species. Option b is wrong as it goes against conservation goals. Option d is incorrect as studying the ecosystem is still important.
2. The Pacific Northwest has unique forest ecosystems and California has diverse ecosystems like coastal and desert - like regions. The Florida Everglades is a unique wetland ecosystem and Hawaii has unique island ecosystems. So both (a) and (b) are correct.
3. The CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) treaty banned imports and exports of all ivory worldwide (option b). Option a is not a part of the CITES treaty's main approach to reduce elephant slaughter. Option c is incorrect as it was a complete ban, not just limiting to the antique market.

Answer:

1. C. more than one species can be saved.
2. C. both (a) and (b)
3. B. It banned imports and exports of all ivory worldwide