21.  Approximately what proportion of the radiant energy entering an ecosystem is used in photosynthesis?

11.  A biological community and its abiotic environment together comprise which of the following?

7.  An example of a density dependent factor that influences the size of a population is:

38.  Which of the following applies to the deepest zone of a large lake?

39.  The ___ realm has long been separated from other land masses and is the area in which marsupials are particularly common.

2.  Which of the following series correctly represents the hierarchical organizations within ecology?

45.  The use of the principles of ecology to return a degraded environment to as functional a state as possible is called:

46.  Which action best illustrates in situ conservation?

PART 1

1.  Which of the following is a correct statement regarding populations in biology?