Explain why there are a large number of marsupial mammal species in australia and south america, two continents that were once connected.
a)
ozone production
eliminate
b)
continental drift
c)
the fifth mass extinction
d)
the first mass extinction

Ifound this on google “the existence of agglomeration economies is central to the explanation of how cities increase in size and population, which places the phenomenon on a larger scale. the concentration of economic activity in cities is one reason for their development and growth.” i hope this you for what your looking for.

Ithink the answer is b : )