Canada, Russia and are areas of large oil reserves.

the United States
Great Britain
Saudi Arabia
South Africa

Saudia Arabia

Explanation:

They are one of the countries who provides for most of the western world and the middle east but still have third largest in the world.

#2 the answer is d

#3 the answer is a

#4 the answer is b

well this is going to be a long answer lol ok so the visigoths were a branch of the goths who frequently raided rome, uh the hunas attacked the guptas a lot and weakened them, uuhm of course the romans used math and science in there every day lives i mean they had a whole empire to run, and rome was split into east and west by a general named diocletian. hope this you! : )