Why Are Australian Mammals All Marsupial While Mammals on Other

question 16

Multiple Choice

Why are Australian mammals all marsupial while mammals on other continents are mostly placental?

• A) The marsupial anatomy is better adapted to the environments of Australia than is the anatomy of placental mammals.
• B) The placental anatomy is better adapted to the environments of North and South America than is the anatomy of marsupial mammals.
• C) When the continents separated from one another, marsupials on Australia did not have the placental competitors that were present in the Americas.
• D) Marsupials out-competed the placental mammals in Australia.
• E) Australian mammals have a different common ancestor than mammals elsewhere in the world.

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