Answer:
B. Australia is isolated
Explanation:
They originated in South America and spread throughout the world, but due to competition on other continents, the other marsupials died out, while the ones on Australia lived.
The system Aristotle created did not allow organisms to be classified into small subgroups where they’d be able to be varied and differentiated, rather, he placed them in plants and animal groups (?) where there allowed to be no classification rather than the basics that included phenotypes primarily. Therefore, his classification system was too general in the sense that in only classified based off general phenotypes rather than sub qualities within the organism.
Hope this helps!
I believe it's the <span>nucleus.</span>