Question

what feature would you expect to find at a passive continental margin?
passive continental margins
seamounts
a deep trench
a continental shelf
none

Explanation:

Passive continental margins form where continental and oceanic crust are not tectonically active, characterized by thick accumulated sediment. A continental shelf, a shallow, gently sloping submerged extension of the continent covered in sediment, is a defining feature here. Seamounts are underwater volcanoes more linked to oceanic hotspots, deep trenches form at active convergent margins, and "no life" is incorrect as these margins support marine ecosystems.

Answer:

A continental shelf