Final answer:
Utopian communities challenged existing ideas about property and marriage by advocating for the abolition of private property and the implementation of communal living.
Step-by-step explanation:
Utopian communities challenged existing ideas about property and marriage by advocating for the abolition of private property and the implementation of communal living.
These communities sought to create a more perfect society based on sharing and cooperation, where individuals lived and worked together for the benefit of the community as a whole.
This often involved communal property ownership and the rejection of traditional marriage in favor of free love or equality between sexes.