5. Which of the following contributed most directly to population changes up to the
first century C.E.?
a. Disease caused a net population decline.
b. The spread of animals and plants increased population in most parts of the world.
c. The interconnection of all the continents led to a diffusion of plants and animals that
increased the population.
d. The net population of Australia/Oceania declined while the net population in other regions
increased.
st be