Briefly describe the role of physical geography in examining intervening obstacles and migration

People need good transportation to move from one place to another. They find it hard to cross the deserts, seas and mountains. Hence they could not migrate easily across these geographies.

It’s either d or b ! but it might be b

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath.