it depends who or what company is going to transport it anywhere around the world
Yes.
yes
No. Live or dead animals entering Mexico without proper registration will be confiscated.
No
Any body related to the person who is dead.
Carefully
Ask an undertaker to do/arrange this for you.
about 1 month
You, as an individual, may not transport a deceased's remains. Only the authorities and licensed funeral homes may do so.
4 mil. not 4 mil. not
yes