yes
Communication has changed very much in the past 100 years.
it hasnt changed really
it is
yes it has changed a lot
it hasn't
not at all
alot
causes of death have changed over the last 100 years due to many reasons, such as a more widespread recognition of illnesses
they have dried up over the years
technoligy has got better and faster
Delhi was changed
they have got bigger and hotter