18. Which is a requirement for the existence of a metapopulation?
I.
a system of habitat corridors that link individual
populations
II. the presence of both r- and K-selected species
III. variation in the size of individual populations
(a) I only
(c) I and II
(b) II only
(d) II and III

Iwill give anyone points if they me right now q: sustainable development is related to pollution in that a. sustainable development allows pollution to continue at current levels. b. sustainable development increases pollution of all types. c. addressing pollution is a factor in sustainable development. d. sustainable development incorporates pollution as a benefit. e. pollution levels will decrease with development.

Which of the following statements is true of how pollutants can enter the environment from a sanitary landfill?

9. our body cells perform several important functions including: a. cell metabolism and energy use b. reproduction and inheritance c. communication d. all of these