Populations of the same species living in different places select one: a. do not vary. b. always show balancing selection. c. have a half-life in relation to the size of the population. d. become increasingly different as each becomes adapted to its own environment. previous page

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

What processes would you expect to be key in the production of yogurt ?