When a Land Bridge Was Reestablished Between North and South

question 18

Multiple Choice

When a land bridge was reestablished between North and South America at the end of the Pliocene,what happened?

• A)Nothing happened because the major mammal groups had not evolved differently since the previous connection had been broken
• B)Only the porcupine,armadillo,and opossum invaded from the south and survived
• C)Both continents immediately dropped in diversity
• D)Many hoofed animals moved north and displaced North American fauna
• E)There was an enormous exchange of species in both directions

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