Why Are Australian Mammals All Marsupial While Mammals on Other

question 7

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 in Australia did not have the placental competitors that were present in the Americas.
• D) Marsupials outcompeted the placental mammals in Australia.
• E) Australian mammals have a different common ancestor than mammals elsewhere in the world.

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Definitions:

Null Hypothesis

A statement used in hypothesis testing that assumes no effect or no difference exists between two or more sets of data.

Hypothesized Value

A specific value proposed as existing or being true within the context of a statistical hypothesis test.

Null Hypothesis

A default statement that indicates no effect, difference, or relationship between two or more variables in an experiment.

Alternative Hypothesis

The hypothesis that is tested against the null hypothesis, usually representing the notion of a difference or effect.