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.What statement is best supported by the survivorship curves? A. American robins have similar death rates throughout their lifespan, while the death rate of common green darners changes over their lifespan. B. A very high proportion of common green darners reach adulthood and live to older ages. C. American robins have a high survival rate for most of their lifespan and then decline rapidly in old age. D. Younger American robins have higher death rates than older American robins, while younger and older common green darners have similar death rates.

The following are characteristics of type 1 survivorship curves EXCEPT:a.High juvenile survival               b.High juvenile mortality c.Low mortality until towards the end of lifespand.Parental care of the young observed

A type I survivorship curve (with low initial mortality) is exhibited by …a) humans.b) birds.c) crustaceans.d) oysters

Migratory birds have suffered due to the loss of across the world because they have been drained and filled in for other land uses. The area covered by these ecosystems is half what it was 100 years ago in the U.S.

study life tables and plotting of survivorship curves of different types from the hypothetical/real data provided

An isolated bird population on a remote island remains relatively constant in size from year to year.  Which of the following most likely describes the birth and death rates for this population?*2 puntosThe birth rate and death rate are both zero.The birth rate is significantly lower than the death rateThe birth rate is significantly higher than the death rateThe birth and death rates are approximately the same.