Economic interdependence is

a. to depend on others for goods.

b. a lack of trade.

c. buying goods with money.

A. to depend on others for goods

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d statement

explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands