Ecological economists have estimated the overall benefit:cost ratio for global conservation of natural habitats to be? 20

1. Ecological economists have estimated the overall benefit:cost ratio for global conservation of natural habitats to be?

100:1

2. 20. Marine Protected Areas are an example of what type of conservation approach?

Ecosystem based

3. All of the following are terrestrial biomes EXCEPT:

kelp forest.

4. A ______________ is a critical resource whose supply determines the population size of a given species in a given biome.

limiting factor

5. Abiotic or biotic components of the environment that serve as storage places for cycling nutrients are defined as _______________.

A. reservoirs

6. Which of the following is the most abundant element in the atmosphere?

nitrogen

7. When nitrogen gas (N2) is "fixed" it forms which of the following?

NH3

8. Which of the following is defined as the smallest number of individuals that would still allow a population to be able to persist or grow, ensuring long-term survival?

minimum viable population

9. Which type of population growth starts out fast but then slows down as the population becomes larger?

logistic

10. . The start of the _______ era was 0.6 billion years ago.

Phanerozoic