What statement is best supported by the survivorship curves? A. American robins have a high survival rate for most of their lifespan and then decline rapidly in old age.

B. American robins have similar death rates throughout their lifespan, while the death rate of common green darners changes over their lifespan.

C. A very high proportion of common green darners reach adulthood and live to older ages.

D. Younger American robins have higher death rates than older American robins, while younger and older common green

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.