Sagot :
All of the statements listed here are factors in the decline of Sumer.
They are all somewhat linked to each other, in that due to the failure
of the soil there was less food available to the people of Sumer -
something which had not previously ever been an issue, in fact they were
able to grow more crops than they actually needed. This of course meant
that the invaded cities were already weakened.
Answer: im not completely sure bud i think all of the above xD