The survivorship curves of the American robin, a type of migratory songbird, and the common green darner, a type of migratory dragonfly, are shown below. which statement is best supported by the survivorship curves?
a. a very high proportion of common green darners reach adulthood and live to older ages.
b. younger american robins have higher death rates than older american robins, while younger and older common green darners have similar death rates.
c. american robins have similar death rates throughout their lifespan, while the death rate of common green darners changes over their lifespan.
d. american robins have a high survival rate for most of their lifespan and then decline rapidly in old age.
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