Question

As the continents drifted apart, plants and animals in each biogeographical realm evolved independently because of:

Options

• Different environmental conditions

• The complete absence of genetic variation

• Identical environmental conditions everywhere

• Frequent interbreeding between realms

Answer 1

As the continents drifted apart, plants and animals in each realm evolved independently due to different environmental conditions. Oceanic barriers prevented mixing, so each realm's flora and fauna followed its own evolutionary path.