Answer:
X: Mold
Y: Cast
Explanation:
A mold is created when the interior is filled by sediment or covers the outside of a dead organism, and the remains of the organism do not survive, leaving only the rock's shape and texture to suggest the organic material that was there.
A cast is created when an animal, plant, or other organism dies, its flesh deteriorates and its bones deteriorate due to chemical reactions; minerals enter the cavity progressively, resulting in a cast that is in the original organism's general form.
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