Begining in the 3rd century, rome was developing a soft belly. what does
that mean?

Based on the given line above which is Rome was developing a "soft belly" beginning in the 3rd century, this means that the Romans became lazy. On the other hand, "soft belly" also means having a harsh time or problems. During this time, The Romans become lazy and that was one of the reasons for the fall of Rome. Hope this answer helps!

Explanation:

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a) the colonists began to see themselves as different from people in britain.