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Identify each of the following as an external cost or external benefit.
a.Second-hand smoke.
b.Noise pollution.
c.Higher college graduation rate.
d.Climate change.
Deuterostomes
A superphylum of animals characterized by the blastopore developing into the anus during early embryo development.
Blastopore
The opening of the central cavity of an embryo in the early stage of development, which eventually develops into the digestive tract in some animals.
Coelom
The fluid-filled body cavity between the intestinal canal and the body wall in triploblastic animals, providing space for the development of internal organs.
Protostomes
A group of animals characterized by developing the mouth before the anus during embryonic development.
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