On March 20, 1982, a team of scientists from the United States returned from a trip to Antarctica with interesting news: They found land-mammal fossils there. The fossils were identified as those of a marsupial, a type of mammal that carries its babies in a pouch. Kangaroos and koalas, native to Australia, are marsupials.

The discovery provided evidence that the “supercontinent” Gondwana existed millions of years ago. Gondwana included parts of present-day Antarctica, Australia, South America, and Africa. There are many marsupials in Australia, and if they're also found on Antarctica, scientists theorized that the two continents were once connected.

Noun

remnant, impression, or trace of an ancient organism.

mammal
Noun

animal with hair that gives birth to live offspring. Female mammals produce milk to feed their offspring.

supercontinent
Noun

ancient, giant landmass that split apart to form all the continents we know today.

theorize
Verb

to formulate and propose a group of ideas to explain a scientific question.

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