Marsupials are found in north america and australia, but they would not have been able to swim across the ocean. according to scientists, how did this group of organisms come to live on two separate continents?
a) marsupials used to have adaptations that allowed them to swim but lost these adaptations over time.
b) the two groups of marsupials evolved independently of one another on two separate continents.
c) the continents were once connected, and marsupials were able to migrate over the land.
d) the oceans were shallow in prehistoric times, which allowed the marsupials to travel from one continent to another.

Answer;

The continents were once connected, and marsupials were able to migrate over the land.

Explanation;

-Marsupials are the group of mammals commonly thought of as pouched mammals. They give live birth, but they do not have long gestation times like placental mammals. Instead, they give birth very early and the young animal, essentially a helpless embryo, climbs from the mother's birth canal to the nipples.

-The first mammals with the marsupial's distinctive mode of reproduction arose on the ancient southern super-continent of Gondwanaland. Later, after this great land mass broke up into separate continents, the ancestors of marsupials were separated from other mammals and evolved in isolation on the new continents of Australia and South America.

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b. lithosphere, asthenosphere, mesosphere   is the answer most likely