Question

been discovered on other continents, including antarctica and parts of asia. yet, these continents are separated by large expanses of ocean. which of the following most likely explains the distribution of marsupial species and fossils across multiple continents? choose 1 answer: a marsupial ancestors evolved independently in both of the americas and australia. b marsupial ancestors swam long distances across the ocean. c marsupial ancestors migrated across continents when they were connected as a single landmass.

Explanation:

• Option A: Independent evolution of marsupial ancestors in different continents is less likely as evolution of similar species independently in multiple distant areas is rare and doesn't explain fossil distribution well.
• Option B: Marsupials are not known to swim long ocean distances, and the ocean expanses are too large for such a migration.
• Option C: The theory of continental drift suggests that continents were once connected as a single landmass (Pangaea or later Gondwana/Laurasia). Marsupial ancestors could have migrated across these connected continents, which explains their distribution across now - separated continents.

Answer:

C. Marsupial ancestors migrated across continents when they were connected as a single landmass.