Which is the subordinate clause in the sentence?
As the layers of ash slowly compressed, partially burned flowers changed into fossils.
Aas the layers of ash slowly compressed
Bpartially burned flowers
Cburned flowers changed into fossils
Dchanged into fossils
As the layers of ash slowly compressed, partially burned flowers changed into fossils.
Aas the layers of ash slowly compressed
Bpartially burned flowers
Cburned flowers changed into fossils
Dchanged into fossils