Multiple Choice
Which part of an organism is typically preserved in cast and mold fossils?
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24. History of Life on Earth
The Fossil Record
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Which of the following organisms would be most likely to form a fossil?
A
A jellyfish
B
A worm
C
A butterfly
D
A clam
Verified step by step guidance1
Understand the conditions that favor fossilization: Fossilization is more likely to occur in organisms with hard parts, such as shells, bones, or teeth, because these structures are less likely to decompose and can be preserved over time.
Consider the composition of each organism: A jellyfish, a worm, and a butterfly all have soft bodies without hard parts, making them less likely to fossilize. A clam, however, has a hard shell that can be preserved as a fossil.
Evaluate the environment where fossilization occurs: Fossilization typically occurs in environments where sediment can quickly cover and protect the remains of an organism, such as in aquatic settings or areas with rapid sediment deposition.
Recognize the role of rapid burial: Rapid burial by sediment helps protect the remains from scavengers and decay, increasing the likelihood of fossilization. Clams often live in environments where sediment can quickly cover them after death.
Conclude based on these factors: Given the presence of a hard shell and the likelihood of rapid burial in sediment, a clam is the organism most likely to form a fossil among the options provided.
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