During the Neolithic Age, the population was able to grow because

The increase in the Neolithic human population following the development of agriculture has been assumed to result from improvements in health and nutrition. ... That is, agricultural populations increased in size, despite higher mortality, because intervals between births became shorter.

Explanation:

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! : )